Try the monitor on another PC first as easiest way to check if grafx card or not. If card is fine then next to check would be the cable (vga/dvi one not the power cable) also make sure refresh rate is 60hz and is at native resolution. If card is at fault make sure it's not too dusty so give it a careful clean and put back in to check before you go buying another one.
See how you get on with that.
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