Did you plug everything in correctly?
Originally Posted by speedy2721
I decided to take out my motherboard to change the thermal paste since I was getting high temps and I remembered that I put on alot last time. I put on artic silver this time instead of IC diamond, but when I turned the computer on, my hd 4850 had two red lights on the back and nothing came up on the screen.
So after the 4850 didn't work, I tried my 8600gt which worked on my other computer and the fan spun but no video came up again. What could cause this to happen? Could I have messed up my PCI Express slots somehow when I took the board out of the case?