On Thursday, July 14, 2016 at 3:05:35 PM UTC-4, wrote:
I have a computer with a funky power supply. It won't turn on until
something in it is warm enough. I have ordered another but a new
problem has cropped up in this computer. The monitor said there was no
signal even though it was connected to the computer. Thinking it might
be dirty contacts I removed the video card and the monitor cable,
cleaned the contacts, and plugged everything back in. No joy. I
unplugged the computer and let it sit about an hour. Plugged it back
in, tried turning it on but had to wait a few minutes for the power
supply to start fully functioning and when it did the computer worked
properly and the monitor had a picture. I left the computer on for
several days and everything worked fine until this morning when once
again the monitor reported no signal and once again no picture. So I
removed power from the computer and removed the video card. I put the
card in the fridge for abou 1/2 hour. Then I put the card back in the
computer, plugged the computer back in, waited the few minutes again,
and now it all works fine again. So, should I start shopping for a
video card too? Could the flaky power supply be affecting the video
card too?
Eric

Since you've already ordered a new power supply I wouldn't go any further until that's installed. If the supply is sluggish or inop when cold, it most likely has high esr electrolytics. Even when warm enough to allow function, they still allow sag and ripple on the outputs which can upset whatever is connected to it. Good chance everything gets fixed with the new supply..