I have 4 Giga-byte K8N-Pro moether boards in rack cases. All the boards are in identical configurations. I bought 4 identical power supplies, hooked all of them up exactly the same, and only 1 boots. The 1 booting machine works whatever power supply is attached.
I figured this ment something was wrong with my boards until....
I took a completely unrelated power supply out of a P4. With that PS I'm able to boot _every_ machine. So I thought, maybe there's some wierd incompatibility. So, I got two more power supplies (for the two non-working computers) by swapping with other machines. All of the new PS's I swapped out work in the old computers, but the old power supplies are not working in the K8N boxes.
All the power supplies are at least 400 Watts, all have identical sets of connectors, and all test ok. When I connect everything and hit the power button on a combo that does not work the MB's power light flickers for an instant and the fans jerk once, but that's it. The onboard 'ram light' comes on and stays on just like it does anytime the board is powered correctly.
Has anyone else had this problem?