Looks like to video card is on its last leg now.
if your computer has built in vga port, transfer the vga cable from the video card and see if the problem disappear. Or better if you have extra video card replace the old one and see if the problem remains.
Most likely its the video card problem, you can also try fixing the vga cable connected on your video card and monitor. It has two screws on both end that need to be fix.
let me know if this help
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