Have you made sure the video cable is plugged into the screen and the back of the computer correctly. You could also try a new video cable, because the problem may be that the wires inside the video cable have frayed. If that doesn't fix the problem you could try using a different monitor and see if you can replicate the same problem with a different monitor, if you can, the computer may have a problem with the graphics card. If you can't replicate the problem with a different monitor, it seems as though your northgate innovations monitor has developed an internal fault, if the monitor is within warranty try and get a free repair or get it replaced (if you have the receipt.
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