|It would be helpful to post your complete system specs or make/model of your computer.|
If it says "no signal" on the monitor screen, the cable & monitor are probably fine. The problem is the monitor isn't receiving a video signal from the video card or onboard video. That could mean the card is bad, but it could also mean the problem lies elsewhere. What happens when you boot the system, are there any beeps? Do you hear the cooling fans spin up? Do the LEDs light up on the case?