I picked up a new XFX Radeon HD 7850 Core Edition 1GB to replace a HD 5750. When it's all hooked up the PC won't turn on. When I pop the old card in, everything works fine. I have a 600 watt ultra power supply, which is 100 watts more than the recommended wattage.
Could it be the 8-pin to 6+2-pin connector? The doc says it needs 6-pin PCI-E from the PSU, but all I had was the 8-6+2 pin. Or could the PSU perhaps not have enough juice? I guess it could also be a dead video card. Hopefully not.