Since I can't edit the post, let me give a part of the solution that I forgot to mention.
I said above:
Quote: "When the screen was steady (after the above efforts) I measured the 5 and 12v rails and they were 4,8 and 11,6."
What I forgot to mention is that at some point I decided to measure...
I know this is an old thread but since I faced the "wobbly screen" thingy (after recapping everything) and busted my hoochie to find who the culprit was, I would like to share it with you.
The symptom was:
Power on -> wobbly screen, no beep.
At first I powered off right away.
Then powered on...