I'm surprised as many people are having issues with it - I've got probably 100+ of them and haven't had a single issue so far.  Does it beep when it boots?  Prior to the bios being displayed, all of mine beep - so if you're not hearing that, it might not even be making it to the point that the video would be initialized.  You might also try forcing it to beep - normally if you boot with the memory removed, that will cause a POST beep to help you identify the issue, no post beep, then the board is probably no good.