Yeah, I got a computer with a TNT2 m64 video card. I changed the network card and added a sound card. When I replug it, a message appread on the screen:"No signal check video cable". I check everything connection and they were all was well plug, even the video cable, but it still gave me that error. The weird thing is that 10 min ago, everything was fine. I unninstall the sound and network card, but nothing. So what do I do now? Thanks.

was the "no signal " message displayed by the monitor itself or did windows boot then display the message. If it is the monitor , then check all the buttons as you may have changed the input (if your monitor has more than 2) , check the monitor connector to make sure none of the pins are bent, and it is connected properly. You could always try the old trick of "unplug monitor , press and hold the power button and plug the monitor in while holding down, let go and switch monitor on. "

If it is your not even seeing the bios boot up screen it is definately either the graphics card (re seat it or try another slot unless its agp) or the monitor.

if you do see a bios bootup screen then push the F8 key repeatedly to get the boot options screen , choose the safe mode option, then change your refresh rate and resolution to sensible values.

Ok, I'll try that. Thanks.