ugh taking things in and out is always a bad idea, ESD might have killed something. All I can think of is making sure the video card is in properly and the monitor is properly connected and all the power cords are back in. As a last resort I THINK its worth a shot putting rubbing alcohol on the contacts on your video card, allowing it to dry then putting it back in. Someone else help me out here, its ok to put rubbing alcohol on the contacts if it drys before you put it back in right?
Also, what do the beeps sound like, there are different beep codes and you could check them out to find out exactly what your motherboard is complaing about.