OK, for some reason what appeared to solve the issue was plugging in a PCI Video Card. No clue why in the world an integrated graphics card would wish to default to a Non integrated display adapter, but compaq was a bit wild back then.
I will still need to diagnose IO issues to get started with getting a Windows 98 installation on this machine.

>default to a Non integrated display adapter

was definitely not the source of your problem. That determination happens Very far into BIOS initialization process.

>RESET held high

did you connect all the case buttons? you might have broken/sticking reset

rasz_pl wrote on 2026-05-21, 08:39:

>default to a Non integrated display adapter […]
Show full quote

>default to a Non integrated display adapter

was definitely not the source of your problem. That determination happens Very far into BIOS initialization process.

>RESET held high

did you connect all the case buttons? you might have broken/sticking reset

I've swapped the power and reset buttons and both function just fine. No shorts on the front panel either.

When the board was stuck in its "Reset" line on, starting the board without RAM did not change the results. Using a Screwdriver to power on the board without any front panel connections had the same results as well.

I'll have to confirm by capturing some in-BIOS screenshots later, but in BIOS there's an "Init Display First" setting that is set to PCI instead of AGP by default after reset.
My assumption is that It checks if there's a VGA card in the PC as one of its first checks or something, because not a single digit on the PCI tester displays, and the RESET line is constantly on without the card.

I'm quite distrustful of pressing the RESET button at all. When I shut it down, I just hold the power button instead of touching the reset button to speed up the reboot.

Currently the BIOS I'm dealing with is extremely limited, and has barely half of the features shown in the BIOS manual. For some reason, F10 enters the BIOS instead of "Delete" in the manual. Do you happen to know any "advanced BIOS" keyboard shortcuts that I could try to get more features?

GroundVale284 wrote on 2026-05-18, 18:58:

I got the motherboard to boot with a red COMPAQ Logo,

GroundVale284 wrote on 2026-05-21, 17:31:

For some reason, F10 enters the BIOS instead of "Delete" in the manual.

F10 is pretty normal for a Compaq

Maybe you had something metallic inside the PCI slot, connecting the reset pin to ground, which then moved away after you inserted a card... (Just a thought...)

GroundVale284 wrote on 2026-05-21, 17:31:

I've swapped the power and reset buttons and both function just fine. No shorts on the front panel either.

but was Reset from front panel connected when you had problems booting? They can get stuck just temporarily. That would completely explain what happened

GroundVale284 wrote on 2026-05-21, 17:31:

Using a Screwdriver to power on the board without any front panel connections had the same results as well.

well, there goes my theory

GroundVale284 wrote on 2026-05-21, 17:31:

in BIOS there's an "Init Display First" setting that is set to PCI instead of AGP by default after reset.
My assumption is that It checks if there's a VGA card in the PC as one of its first checks or something, because not a single digit on the PCI tester displays, and the RESET line is constantly on without the card.

CPU doesnt run _at all_ when reset is high, and checking which Video to initialize happens quite far into the Bios code.

GroundVale284 wrote on 2026-05-21, 17:31:

Currently the BIOS I'm dealing with is extremely limited

I would just reflash it to normal non branded bios

I think what happened to you is what exactly happened to me.
In fact, I also obtained my GIGABYTE GA-5SMM from a Compaq box back in 1999.
If my research is correct, the computer in question was Presario 5360.
It had AMD-K6-2 380 MHz, 64 MB of PC100 SDRAM, 4.3 GB Seagate hard drive, and Windows 98.
I upgraded the system with the last release (I think it was version F6) of GIGABYTE retail BIOS due to it having better large (i.e., > 32 GB) hard drive support.
I eventually switched to a 60 GB IBM hard drive and installed Windows 2000.
If you switch to GIGABYTE retail BIOS, Compaq's restore software will no longer work properly so be aware!

I think I got it free from an Internet based startup that required me to connect up via their dial-up (yes, people still used 56K dial-up modem until early 2000s) service, and had to run their built-in adware (spyware) at least 20 hours per month.
That was the requirement for getting this free system.
This was more than a quarter century ago event, so I do not remember everything 100% correctly.
The full package also included a 15 inch monitor.
The system just showed up one day in front of my house delivered free of charge.
I think the whole system cost about $600 to $700 retail back in 1999.
A year or so later, this startup's spyware technology was purportedly purchased by another firm, so the users were told that we can have the computer and even gave instructions on how to permanently remove this spyware from our computers.
I used this computer until 2007 or so when I switched to ASUS P2B + Pentium II 400 MHz, and was quite surprised to see my Xilinx FPGA design software ran much faster on Pentium II.
That was pretty much the end of front line use of Compaq Presario 5360.
After that, I still played around to experiment with Ubuntu, but did not use it too frequently anymore.

Although it is OT, this mainboard has an odd bug that prevents proper operation if 512 MB or more RAM is installed.
It gives intermittent errors in memtest86 if one installs 512 MB or more RAM.
Based on my testing, it was running reliably up to 448 MB of RAM (3 slots, 6 rows of SDRAM).
256 Mbit SDRAM is apparently supported by the mainboard, not that it matters.

Okay, here is what is relevant to you.
I have had the exactly same issue of this mainboard suddenly dying one day.
I thought about a bad power supply killing the mainboard, although the power supply I used with it was always a small sized Delta power supply that originally came with the system.
Can the NOR flash that came with the mainboard just suddenly lose its content?
This happened to me between 2018 to 2021 (I do not really remember which year exactly.), and because I have a lot of other boards, I still have not bothered to troubleshoot what went wrong with this system.
That's just my 2 cents, and I hope it is relevant to you.
Reflashing the BIOS should be considered, although aflash memory writers costs around $60.

bracecomputerlab wrote on 2026-05-22, 05:39:

I think what happened to you is what exactly happened to me. In fact, I also obtained my GIGABYTE GA-5SMM from a Compaq box back […]
Show full quote

I think what happened to you is what exactly happened to me.
In fact, I also obtained my GIGABYTE GA-5SMM from a Compaq box back in 1999.
If my research is correct, the computer in question was Presario 5360.
It had AMD-K6-2 380 MHz, 64 MB of PC100 SDRAM, 4.3 GB Seagate hard drive, and Windows 98.
I upgraded the system with the last release (I think it was version F6) of GIGABYTE retail BIOS due to it having better large (i.e.,
If you switch to GIGABYTE retail BIOS, Compaq's restore software will no longer work properly so be aware!

That was pretty much the end of front line use of Compaq Presario 5360.

I thought about a bad power supply killing the mainboard, although the power supply I used with it was always a small sized Delta power supply that originally came with the system.
Can the NOR flash that came with the mainboard just suddenly lose its content?
This happened to me between 2018 to 2021 (I do not really remember which year exactly.), and because I have a lot of other boards, I still have not bothered to troubleshoot what went wrong with this system.
That's just my 2 cents, and I hope it is relevant to you.
Reflashing the BIOS should be considered, although aflash memory writers costs around $60.

Thank you very much for the additional information!
From my best estimation this motherboard is definitely some sort of replacement for a compaq computer in the 5300 Series. Before I reset the BIOS, the primary video feed was going through the integrated graphics, as far as I'm aware.
F10 brings me to a super limited BIOS, there's no BIOS settings as far as I could see for any degree of configuration for drives.

I'm planning on using an 80GB Maxtor IDE HDD for the project, where there's 30GB for the OS and the rest would store games and such. Does anyone else know how to access a more extensive BIOS for this machine? I'm hoping to restore the machine, minus the case, and plus potentially a socket 7 CPU Upgrade, to be a compaq machine at least on paper.
I think I'll have to continue my studies on why exactly the motherboard has been acting like that, but it gives me hope this little system is somewhat operational aside from figuring out why the heck it can't boot to anything in particular.

bracecomputerlab wrote on 2026-05-22, 05:39:

I upgraded the system with the last release (I think it was version F6) of GIGABYTE retail BIOS due to it having better large (i […]
Show full quote

I upgraded the system with the last release (I think it was version F6) of GIGABYTE retail BIOS due to it having better large (i.e., > 32 GB) hard drive support.
I eventually switched to a 60 GB IBM hard drive and installed Windows 2000.
If you switch to GIGABYTE retail BIOS, Compaq's restore software will no longer work properly so be aware!

Although it is OT, this mainboard has an odd bug that prevents proper operation if 512 MB or more RAM is installed.
It gives intermittent errors in memtest86 if one installs 512 MB or more RAM.

The motherboard itself Allegedly comes with a Cyrix MII PR333 (haven't been able to 100% Confirm, but the jumpers are set to match it), and 64MB of SDRAM. I have 3x 128MB SDRAM to try and upgrade it with for a maximum of 380MB of RAM, but I'm keeping the build conservative if possible.

Could another reason why I can't actually see the drive I've hooked up into it be the fact that the drive I'm using is 60GB large? The best solution to this may be a CompactFlash Adapter and a 32GB CompactFlash card.
The Windows 98 installation I was using for testing is on a 512GB Drive with a 27GB partition I had whipped up on GParted using my Athalon XP build, cause I have no other IDE compatible motherboards and I am unsure what to trust to use an IDE adapter for USB.

Also, unless it's aboslutely needed, I'm thinking of keeping the BIOS if I can manage it.

GroundVale284 wrote on 2026-05-22, 15:44:

Thank you very much for the additional information!
From my best estimation this motherboard is definitely some sort of replacement for a compaq computer in the 5300 Series. Before I reset the BIOS, the primary video feed was going through the integrated graphics, as far as I'm aware.
F10 brings me to a super limited BIOS, there's no BIOS settings as far as I could see for any degree of configuration for drives.

I think I remember the Compaq vendor stringed version of the BIOS was rather limiting in the BIOS setup screen.
Obviously, this is very common with any retail PC vendors.
The Compaq vendor stringed version of the BIOS is pretty much only useful for performing CD based original restoration of the hard drive, and if I were you, I will override with the GIGABYTE retail version BIOS.
I did my research on the BIOS releases, and Version F5 (final release) fixes issues with hard drives> 64 GB.

Description - Support AMIC A29002 EEPROM - Support more than 64GB HDD Version F5 Size 395.87 KB Date Nov 26, 2000 […]
Show full quote

Description - Support AMIC A29002 EEPROM
- Support more than 64GB HDD
Version F5
Size 395.87 KB
Date Nov 26, 2000

I stand corrected that the BIOS version I meant was F5, not F6 I wrote in my previous post.

I'm planning on using an 80GB Maxtor IDE HDD for the project, where there's 30GB for the OS and the rest would store games and such. Does anyone else know how to access a more extensive BIOS for this machine? I'm hoping to restore the machine, minus the case, and plus potentially a socket 7 CPU Upgrade, to be a compaq machine at least on paper.
I think I'll have to continue my studies on why exactly the motherboard has been acting like that, but it gives me hope this little system is somewhat operational aside from figuring out why the heck it can't boot to anything in particular.

This mainboards only allows the external onboard PB Synchronous SRAM cache to cache the first 64 MB when it is populated with 512 KB of cache.
The GA-5SMM sold to Compaq probably all had 512 KB of external cache memory.
Basically, adding more than 64 MB will cause slower access to anything above 64 MB.
I got tired of the general instability of Windows 98 that I eventually upgraded the computer with Windows 2000 Professional (there was no "Home" edition for Windows 2000; that was only for Windows XP).
Windows 2000 ran fine with this mainboard, but obviously I had to add more RAM.
I must have been running this mainboard with more than 64 MB for years.
Of course, it ran okay.

The problem with SiS530 integrated graphics is that, at best, the main memory has only 800 MB/s of peak band with.
This is particularly noticeable when you switch to 32-bit color mode.
It is not like one sees flickers on the screen or the system becomes unstable, but causes noticeable drop in overall system performance.
What I mean by "noticeable drop in overall system performance", is Windows 2000's Start button pop-up menu animation (that is how I call it) becoming noticeably slow if 32-bit color mode is used.
To keep the computer somewhat performant, I will highly recommend adding a PCI graphics card that performs better than SiS530 integrated graphics, or at least keep your color depth to 16-bit, 60 to 75 Hz refresh rate, and no more than 1024 x 768 screen resolution.
In my case, I bought VisionTek GeForce 2 MX200 32 MB PCI card, and it gave me noticeable improvement in the system performance.
The only thing I noticed about GeForce 2 MX is that the device driver that came with the VisionTek graphics card caused a black screen after installing, but downloading the newer version from NVIDIA website resolved the issue.
It probably was a SiS530 related issue that was fixed by NVIDIA eventually.

Anyhow, here is my recommendations on what to do if you get the mainboard working.

1. Update the BIOS to Version F5 immediately
2. Add a PCI graphics card so that you do not have to rob from your precious 800 MB/s 100 MHz SDRAM peak bandwidth
3. If you insist on using the SiS530 integrated graphics, use 16-bit color mode with 60 to 75 Hz refresh rate and maybe 1024 x 768 screen resolution at most
4. Installing 512 MB or above amount of RAM causes memory error likely due to a chipset bug, so keep the RAM to at or below 448 MB (256 MB + 128 MB + 64 MB
5. Remember, no external, onboard caching above 64 MB (use AMD-K6-III for the ultimate system performance for this mainboard due to its generous 256 KB of on chip L2 cache with a full 4G caching range)

Overall, the mainboard was fairly stable, and it served me reasonably well for my personal computing needs back in the days.

GroundVale284 wrote on 2026-05-20, 20:53:

OK, for some reason what appeared to solve the issue was plugging in a PCI Video Card. No clue why in the world an integrated graphics card would wish to default to a Non integrated display adapter, but compaq was a bit wild back then.
I will still need to diagnose IO issues to get started with getting a Windows 98 installation on this machine.

I read the GA-5SMM user guide and it says you need to install a DIMM in DIMM slot 1 for the integrated graphics to work.

I know this is a super-late update, but I've finally managed to get this motherboard functional with Windows 98!
I took a Maxtor 60GB IDE Drive and inserted a jumper to limit its size to 32GB, set up a partition in FDISK, and I was on my way to install Windows 98 for it.
Obviously, performance is a tad limited due to only 2 USB 1.0 ports in the rear, and having an S3 Virge in the thing, but I'm not looking for high performance on this one.

I still have issues with powering it on sometimes, but I've found this procedure to be mostly foolproof to prevent the issues from occurring again:
After full shutdown, switch off power supply and unplug power plug to allow motherboard to completely power off.
Avoid, if at ALL possible, a full shutdown and reboot commanded by the power button instead of the "Restart" command in Win 98.

If the error occurs again where the board powers on, but the CPU doesn't start:
(Unsure which does the trick but I'm pretty sure the RAM complaint makes the difference)
Power off the machine completely and clear the CMOS.
Remove all RAM, Clear CMOS again.
Power on and Start machine without RAM. If it's beeping and complaining that there isn't RAM, it's a good sign.
Power off the machine completely and re-insert RAM, it should boot normally. If the fans spin and the Compaq Logo doesn't show up within about 5 seconds, it's doing it again.