my pc ws struck by a lightning i took it to the repair shop nd they replaced the power supply. everything seems to be opereting but i don't get any video output. if u guys can help me with some ideasi would realy apreciate it.
It could be a monitor issue. Has the PC worked in the repair shop?
If the cable is connected and on the monitor is says no signal then the monitor is ok and you probably have a problem in any other component.
Does your computer have on board graphics and a separate video card? If so you can try the other connector than the one you're using now.