Hello, I've recently installed an HIS 6870. I know for a fact that power consumption is not a problem since i have a 600Watt Corsair PSU. During startup, I see my desktop, Skype loads, MSN loads, then my screen turns white, black, then no signal. Also, my graphics card is not overheating either, its at 33 degrees celsius. Any ides guys? It sometimes crashes and sometimes does not. Also, this is not a homebuilt computer, I've just swapped my graphics card.
P.S. I dont know where this goes, so I put it at the Graphics card section.
If the above doesn't work you may have downloaded some apps recently which may be causing a problem. If you type in MSCONFIG and go to services. Uncheck any services that you absolutley don't need such as Ipod and the like. You make have to google a few as not all of them are obvious. Once done re-boot the PC and see if that helps.