Check CMOS battery

I replaced the cmos battery. Still will not turn on.

Did you recently make any changes in the BIOS such as CPU voltage or clockspeed settings? If so, maybe try clearing your CMOS - should be a jumper for that. Other than that (assuming you're not getting any beep codes from the speaker) the next thing to check would be the CPU itself. ASUS also has a thorough albeit basic list of additional troubleshooting items here: https://www.asus.com/us/support/faq/1042632/#2

Matrolisk wrote on 2024-03-20, 22:09:

I replaced the cmos battery. Still will not turn on.

Do you have a POST test card? If so, what code does it give you? If not, try removing all the cards and memory and attaching a pc speaker and listen for beeps.

> when I hit the power switch nothing happens

Absolutely nothing at all? i.e. not even the PSU fan starting?

Reseat all your cables, and make sure that everything that needs to be plugged in, is. I tend to forget about that extra 4pin power connector going to the mainboard, for example. And the front panel headers (for power switch, leds and such) are easy to mess up too.

Unplug everything, sit staring at it for 30 minutes while eating slices of apple off your largest hunting/carving knife. Plug it all back in again and give it another go.

BitWrangler wrote on 2024-03-21, 00:57:

Unplug everything, sit staring at it for 30 minutes while eating slices of apple off your largest hunting/carving knife. Plug it all back in again and give it another go.

And if all else fails, a decent hunting knife should serve as a universal tool (better known as a hammer!).

Also stop hitting your computer
https://www.youtube.com/watch?v=bifOI4MbHVU

Was this computer working until recently, or did you just assemble it?

DosFreak wrote on 2024-03-21, 01:30:

Also stop hitting your computer
https://www.youtube.com/watch?v=bifOI4MbHVU

Might have missed the real trick in the comments... https://www.campus.sg/this-taiwanese-snack-en … erly-campus-sg/ seems to work like magic tree air fresheners work on northern european cars.

(Edit: I used to think Magic Tree was original and Little Tree was knockoff... and I guess it was actually the WunderBaum that my Norwegian buddy told me was essential to the correct operation of his aircooled VW )

Have you tried turning it off and on again ?

More seriously, and as others have mentioned, it would really help if you could give us some more context.

Among other points:

- when did this machine, as currently assembled, last worked (if ever) ?
- if this is newly assembled were all parts sourced from recently working machines and/or recently tested ? Please also define recently.
- what brand and model is the PSU ?
- is the power switch wired to the right header on the motherboard ?

Most if not all of the parts in this machine are 20+ years old. Reliability is not guaranteed with parts that old, so even something that worked 1 hour might not work now or be intermittent. This can also happen with recent parts, of course, it is just more likely with older parts.

BitWrangler wrote on 2024-03-21, 03:31:

DosFreak wrote on 2024-03-21, 01:30:

Also stop hitting your computer
https://www.youtube.com/watch?v=bifOI4MbHVU

Might have missed the real trick in the comments... https://www.campus.sg/this-taiwanese-snack-en … erly-campus-sg/ seems to work like magic tree air fresheners work on northern european cars.

(Edit: I used to think Magic Tree was original and Little Tree was knockoff... and I guess it was actually the WunderBaum that my Norwegian buddy told me was essential to the correct operation of his aircooled VW )

Thanks for the tip. I'll have to get some of those things. The innocent blood sacrifice is much harder to achieve these days with modern cases and the intentional blood sacrifice is not nearly as effective and tends to gum up the fans.

This is a newly assembled build.
All parts were listed as tested and working.

The only part I can confirm as working is the GPU as I was able to use it on a different board.

The PSU is a new Corsair Semi-Modular ATX CX450M which I have tested and it works.
The motherboard does not have any 4pin CPU connector just the main 20pin one.

I checked the manual for the board and made sure the power switch was connected to the right pins.

When I hit the power button nothing happens at all. No fans or beeps.

Hmmm amps on 3 and 5v seem fairly reasonable, I think it might have that ATX 2.4 signalling/sensing problem that some other ppl have had trouble with.... But that's hard to test for unless you have "perfectly working setup that has worked all together recently with a different PSU"

You could try to force the PSU on by shorting PS-On to Ground/common. Usually the PS-On is green wire but Corsair did not color code your PSU (unlike most ATX which do have colors)
refer to this for the 20pin ATX: http://www.interfacebus.com/ATX_Motherboard_M … tor_Pinout.html
Be very careful since your wires are not colored and you could make a bad mistake 😒

Oh ASUS boards have another little trick that should be mentioned, a little "KB-PWR" or similar named jumper which disables the case power button in favor of having to hammer the keyboard spacebar to have it come to life.

Ahh yes, has a jumper for P.button Soft On or Suspend/resume or some such iirc. Assumed his was jumpered correctly.
added: Oh yes page 20 of the manual......
added2: picture shows default enabled yet the small text says default is disabled..

The PSU does work I have tested it on another computer with no issues.

I changed the jumper position from enabled to disabled but that did not resolve the issue.

I tried three different PSU which are much older, one of which came out of an HP computer that was from the same era as the motherboard.
Two of them I have tried recently so they work. None of them powered on the computer, but they did make an odd clicking sound when plugged into the motherboard.
They did not do this when I did not have them plugged into anything.

sounds like a short on the board, probably bad caps.... can you post a picture ?