Did you try a different CPU? Had something similar with a broken AMD CPU. The PSU would just shut down after 5 seconds.

It's two boards with two different CPUs and the Asus setup is _supposed_ to work from seller.
Can always try to switch CPUs around on the two Motherboards.

Those newer psu cant properly handle the load on +5v rail required by the socket 462.
PhilsComputerLab had a video testing some power supplies with some cpu.
Usually i go straight to a new corsair psu for old computers, but on my athlon xp i took the care of refurbish one old psu that had died on me just because of the high current rating on the +5v

Tnx. Found the PhilsComputerLab video while browsing for a solution and suspect that the 5V rail might be the issue.
What puzzles me is that the motherboard went through POST with one of the PSUs before the caps blew 🙁

Will see if I can source an old PSU for this project. I guess I'll have to switch to a P4 setup if not.

It could also be the CPUs.

I've got a large number of Socket A CPUs. Most of them don't work at all.

If at least one of the corners is chipped and they aren't working, it is a good indication that they are dead.

cyclone3d wrote:

It could also be the CPUs.

I've got a large number of Socket A CPUs. Most of them don't work at all.

If at least one of the corners is chipped and they aren't working, it is a good indication that they are dead.

I would lean toward this being the issue.

They were nice processors at the time but the failure rate from physical damage or heat over the years is astronomically high compared to other CPUs. The Socket A era is one I really enjoyed but I absolutely hate dealing with the processors. I have Athlons and boards that have been running and working fine for 15 years, so in the right situations they're great, but you can damage them by just looking at them wrong and most of the ones you'll find used have probably been abused.

Abit NF7 is supposed to use the 12V rail for the processor, so I doubt the PSUs are the problem.

Munx wrote:

Abit NF7 is supposed to use the 12V rail for the processor, so I doubt the PSUs are the problem.

This is what made me suspect the 5v lines, it's a really common problem.

Many NF boards use a separate 12v connector and need less power from the 5v line, so newer PSUs have a better chance of succesfully working with such a board.