Fan spinning, no POST.

I replaced a ram stick on my mobo (L7S7A2) and the computer wouldn't
boot. I put back my old stick, cleared the CMOS and it would boot, but
when I pressed the power switch to turn it off so I can close the case
it would close and start again, so after trying 3-4 times I pulled the
plug.

Now it won't post, cpu fan is spinning, nothing else. I tried removing
everything, trying all kinds of combinations, nothing. I measure the
voltages from a molex connector with a multimeter and they are 5V for
the 5V rail and only about 6V on the 12V rail.

Please note that for the past month or so my computer would restart by
itself after booting if it was cold, until the PSU (presumably) would
reach a good temperature (again, presumably).

Any help? Is the mobo fried or the PSU?

your going to have try that again. 12v is the yellow and a black wire off a molex.

you would like to see 11.7-12.30v.

also try clearing cmos with psu unplugged and battery removed. try other memory slots with the old stick and make sure it seats properly.


ud