Changed memory sticks and cleaned the CPU socket, tried different CPU's. Did a visual inspection on the microscope around the AGP slot and everything looks good. Removed one of the 330uf 25v caps near the AGP slot to test and it's 100% in spec. Ran a thermal cam over the board and temps look fine. Double confirmed the motherboard is booting perfectly and thinks the video card is fine, the monitor is just not picking up any signal.

Probably unnecessary, but I'd try turning off 3.3Vsb for the AGP port via jumper if anything changes.

hmm.. Interesting.

You could check for the regular voltages:
12V, 5V and 3.3V and VDDQ.
https://old.pinouts.ru/Slots/agp_pinout.shtml

They should all be within margins. I thought about the cards that you use for testing. The 9200SE also (if reference design) uses all rails, incl. the 12V (for opamps / bias feed of regulators) - so I'd be surprised if that'd be the issue. However, the 9200SE draws no significant current from 12V, unlike other cards. (never measured a voodoo 5500 though)
However i think it's worth a measure, just to make sure the cards get what they need.

Let's start with power first.
The interesting part is that you mention the board boots up nicely, even without display. I've had this with cards that don't have good contact / dirty goldfingers.

Edit:
What's the setting of the AGP_OV dip switches?
What's the setting of the PCI/AGP 3VAUX jumper?
How does the 9200SE report in GPU-Z? Which AGP speed is reported, does the 9200SE actually "perform"?

If you had to use deoxit on the ps2 I'd be suspicious of corrosion elsewhere

You should also probably check voltages on the agp slot, it's totally possible that one may be missing on a certain pin - this could bother some cards and not other ones

I was going to suggest trying a card with an external power connector, but it looks as though you covered that with the 9700 Pro?

Repo Man11 wrote on 2025-11-16, 17:36:

I was going to suggest trying a card with an external power connector, but it looks as though you covered that with the 9700 Pro?

He did. However, they still take power from the slots.

See https://tehsiggi.github.io/agp-power-monitor/ … _radeon9700_128

Ydee wrote on 2025-11-16, 08:39:

Probably unnecessary, but I'd try turning off 3.3Vsb for the AGP port via jumper if anything changes.

Thanks for the suggestion. I've now tried this but no change 🙁

bertrammatrix wrote on 2025-11-16, 16:54:

If you had to use deoxit on the ps2 I'd be suspicious of corrosion elsewhere

You should also probably check voltages on the agp slot, it's totally possible that one may be missing on a certain pin - this could bother some cards and not other ones

I've since found out it's the PS2 mouse port that's not working so spraying the keyboard PS2 did nothing. This is a common issue with these boards from this era. I should be able to fix the problem by replacing a resistor array behind the port.

tehsiggi wrote on 2025-11-16, 15:34:

hmm.. Interesting. […]
Show full quote

hmm.. Interesting.

You could check for the regular voltages:
12V, 5V and 3.3V and VDDQ.
https://old.pinouts.ru/Slots/agp_pinout.shtml

They should all be within margins. I thought about the cards that you use for testing. The 9200SE also (if reference design) uses all rails, incl. the 12V (for opamps / bias feed of regulators) - so I'd be surprised if that'd be the issue. However, the 9200SE draws no significant current from 12V, unlike other cards. (never measured a voodoo 5500 though)
However i think it's worth a measure, just to make sure the cards get what they need.

Let's start with power first.
The interesting part is that you mention the board boots up nicely, even without display. I've had this with cards that don't have good contact / dirty goldfingers.

Edit:
What's the setting of the AGP_OV dip switches?
What's the setting of the PCI/AGP 3VAUX jumper?
How does the 9200SE report in GPU-Z? Which AGP speed is reported, does the 9200SE actually "perform"?

I installed Windows 98 and then I remembered GPU-Z only works in XP and up. So I ran Everest and got what I could (see attachments below). I then installed XP but when I ran GPU-Z the machine blue screened (both the 9200 and Ti500). So there is definitely something wrong with the AGP on this board.

tehsiggi, I think before we dive into a diagnostics session, let me fully recap the board. I've also ordered the voltages regulators around the AGP slot and crystal clocks, just in case. So let me swap out as many components as possible and then continue with the diagnostics (if the issue isn't resolved). I feel bad taking up all your time with my problems 🤣. You time is greatly appreciated.

zuldan wrote on 2025-11-19, 06:08:

AGP Controller:
AGP Version 2.00
AGP Status Disabled
AGP Device Asus A9200SE
AGP Aperture Size 64 MB
Supported AGP Speeds 1x, 2x, 4x
Fast-Write Not Supported
Side Band Addressing Supported, Disabled

shevalier wrote on 2025-11-19, 08:18:

AGP Controller: AGP Version 2.00 AGP Status Disabled AGP Device Asus A9200SE AGP Aperture Size 64 MB Supp […]
Show full quote

zuldan wrote on 2025-11-19, 06:08:

AGP Controller:
AGP Version 2.00
AGP Status Disabled
AGP Device Asus A9200SE
AGP Aperture Size 64 MB
Supported AGP Speeds 1x, 2x, 4x
Fast-Write Not Supported
Side Band Addressing Supported, Disabled

Interesting! AGP Status Disabled. I think I’ll go and check all the resistor values around the AGP port as well.

Although….I did not install the chipset drivers. Not sure if that’s needed with this board though.

zuldan wrote on 2025-11-19, 08:24:

shevalier wrote on 2025-11-19, 08:18:

AGP Controller: AGP Version 2.00 AGP Status Disabled AGP Device Asus A9200SE AGP Aperture Size 64 MB Supp […]
Show full quote

zuldan wrote on 2025-11-19, 06:08:

AGP Controller:
AGP Version 2.00
AGP Status Disabled
AGP Device Asus A9200SE
AGP Aperture Size 64 MB
Supported AGP Speeds 1x, 2x, 4x
Fast-Write Not Supported
Side Band Addressing Supported, Disabled

Interesting! AGP Status Disabled. I think I’ll go and check all the resistor values around the AGP port as well.

Although….I did not install the chipset drivers. Not sure if that’s needed with this board though.

For windows, install them. To post? No, they shouldn't be needed.

tehsiggi wrote on 2025-11-19, 09:25:

zuldan wrote on 2025-11-19, 08:24:

shevalier wrote on 2025-11-19, 08:18:

AGP Controller: AGP Version 2.00 AGP Status Disabled AGP Device Asus A9200SE AGP Aperture Size 64 MB Supp […]
Show full quote

AGP Controller:
AGP Version 2.00
AGP Status Disabled
AGP Device Asus A9200SE
AGP Aperture Size 64 MB
Supported AGP Speeds 1x, 2x, 4x
Fast-Write Not Supported
Side Band Addressing Supported, Disabled

Interesting! AGP Status Disabled. I think I’ll go and check all the resistor values around the AGP port as well.

Although….I did not install the chipset drivers. Not sure if that’s needed with this board though.

For windows, install them. To post? No, they shouldn't be needed.

Nah not to post. I know with socket 7 motherboards in Windows 98 you had to install chipset drivers for Windows to see the graphics card as “AGP”. I thought maybe that explained why Everest is reporting AGP Disabled. But I don’t think that’s even a thing in Windows XP.

tehsiggi wrote on 2025-11-19, 09:25:

zuldan wrote on 2025-11-19, 08:24:

shevalier wrote on 2025-11-19, 08:18:

AGP Controller: AGP Version 2.00 AGP Status Disabled AGP Device Asus A9200SE AGP Aperture Size 64 MB Supp […]
Show full quote

AGP Controller:
AGP Version 2.00
AGP Status Disabled
AGP Device Asus A9200SE
AGP Aperture Size 64 MB
Supported AGP Speeds 1x, 2x, 4x
Fast-Write Not Supported
Side Band Addressing Supported, Disabled

Interesting! AGP Status Disabled. I think I’ll go and check all the resistor values around the AGP port as well.

Although….I did not install the chipset drivers. Not sure if that’s needed with this board though.

For windows, install them. To post? No, they shouldn't be needed.

Alright, just to recap

- Board only boots with two AGP cards (ATI 9200SE and a Ti500 (Green reference)
- In Windows the drivers for each card installs fine, no issues in Device Manager
- As soon as you run GPU-Z, the computer locks up. Hard reset required.
- Double checked the AGP pins in the slot under a microscope. They all look good. Also used a ton of contact cleaner.
- Board has now had a FULL recap

I've taken some measurements below;