>>Have you verified that the PSU powers up OK on its own?  ATX supplies
>>are, in my experience at least, generally willing to power up with =
zero
>>load; just ground the "please power on" line.  (This, again in my
>>experience, is a green wire going to the 2x10 connector, in the middle
>>of a bunch of grounds (black) on one side.  It is a lighter (thinner)
>>wire than most of the wires to that connector.)  Conveniently, there
>>are a bunch of grounds right next to it, so just a piece of wire bent
>>to fit between two adjacent pins should do the trick.  Always has for
>>me, at any rate. :)

>Yes, I just now checked this: the PSU does indeed power up when PS_ON
>is grounded,  I'll see what happens when I try to connect to the =
motherboard
>with the grounding in place.

What happens when trying to power up the computer with the above =
grounding
is that the PSU powers on and the speaker beeps the pattern 3 + 2 + 3;=20
however I do not get any output on serial port or display. Hm.

/Emil