In this thread
I described a problem I had with my PSU. I RMA'd it and received a replacement from Seasonic. The RMA went smoothly (aside from waiting for coast-to-coast shipping, which can't really be helped), and I've determined that the new PSU should be OK (paper-clip connecting green and black wires allows PSU fan to spin up).
But the system still won't boot
. The relevant components: Soltek SL-K8TPro-939 motherboard, AMD 3500+ 90nm CPU, and Seasonic Super Silencer 400. I think I was extremely unlucky and experienced simultaneous failure of PSU and motherboard.
I discovered that when I connect the 4-pin +12V CPU cable to the motherboard, the PSU fails to power on and the computer fails to boot. If I unplug this single +12V CPU cable from the motherboard, the case fans spin up. I have not experimented with plugging in disk drives to see if they also power up, but I believe that this is sufficient evidence that the motherboard and/or CPU is defective.
So, given the above description, is it possible to determine whether it is the motherboard or CPU that is defective? Do you need more information? At this point I believe it is the motherboard, so I will be RMA'ing that with NewEgg.