回复：电脑黑屏求教!!!

Turn off your PC, and turn it on after a couple of minutes. If 主机灯乱闪,屏幕显示"no signal" still occurs, then it is possible that 1>. the video card is not connected to the motherboard. You can try to push the video card into the AGP (PCI or PCI-E) slot a little bit. Then turn on the PC, your PC should be normal. 2>. If re-seating the video card does not correct the problem, it is more likely that you have a broken video card.