PC and card worked fine till a few months ago till I went to replace the leds on front of pc so had to remove card to acess the front panel connector.
When I put it back it worked itermittantly i.e if I powered on PC the post screen didnt appear and I have to leave the card 5-10 minutes to heat up then power off then back on then it worked each time.
one day I put a dab of WD40 onto the connectors then it worked fine for the months following till I had to remove card and mobo as I wanted to clean the fans.
Since then it has pretty much not worked at all, if I give the card or power connector a nudge when turned off it seems to work, but when I power off again and put side of case back on it no longer works.
the strange thing is its going into Windows you just cant see whats on the screen!
Anyway to test the rails?
EDIT : its a HD4870 2 years old, and PSU is a OCZ Stealhstream 600W psu, only other card I own is a 9800GT that doesnt need the power rail so its hard to test, but the 9800GT works first time so its not the slot.