Doornkaat wrote on 2020-10-13, 15:23:

What would cause a permanent reset?

Lots of things. My first idea is a missing or wrongly set CMOS jumper or missing CMOS battery but it could also be caused by missing power good signal, a bad or maybe incompatible CPU, all sorts of defective ICs... It's anyone's guess really.

BTW, you were right about the permanent reset. I just noticed the reset LED is constantly lit on the diagnostic card.

TechieDude wrote on 2020-10-16, 22:41:

Hmm, have you tried cleaning the slots and the DIMMs? A toothbrush with rubbing alcohol works well for the former, and an eraser can work surprisingly well for the latter. However, since you mention the diagnostic card doesn't show anything, that might be a sign of something deeper. IIRC a diagnostic card should have shown something, even if it were a RAM issue, never used one though tbh. (Can anyone who has used one chime in?) I have a hunch it might be the BIOS chip. Would you happen to have an EEPROM burner?

I don't have an EEPROM burner, though I have been wanting to buy one for a while.

But I think I might try and get a new PSU first. Any suggestions for a good mATX PSU for a Socket 370 system? Regular sized PSUs will not fit in this case.

Permanent reset, eh? Is there a chance the reset switch jumper on the board has a short?

I don't see any sign of a short on the reset pins.

I can only find a couple of decent mATX / compact SFX PSUs that will fit in this case:

1. Seasonic 200SFD - released around 2003
2. FSP300-60GHS - released around 2009

Any suggestions on which one would be better? I'm leaning towards the FSP because it would be slightly newer.

Before you go ahead and buy a PSU, do you have any other PSUs to test on your motherboard or other motherboards to test with the same PSU?

TechieDude wrote on 2020-10-17, 19:27:

Before you go ahead and buy a PSU, do you have any other PSUs to test on your motherboard or other motherboards to test with the same PSU?

I don't have another PSU lying around. The PSU in the case still works with the old motherboard that I am trying to replace because it doesn't have any ISA slots, or any support for VIA C3 CPUs. I thought the theory was that the new motherboard needed more power than the old one to powerup.