I have a Visiontek ATI Radeon 5670 video card in my desktop. it ran fine for about a week with intermittent blue screen issues but now I cannot get a signal to a monitor. I can't tell if it is my video card or what else. I have tried using different monitors and different ports but nothing works.
It could be the video card, it could be the power supply. The only way to know is try another video card.