Please for the sake of saving energy don't leave your work(or any) PC on when not in use.
The problem sounds like interference, please unplug the display cable and plug it back properly.
If the problem still persists then open up the CPU case and take out the graphic card(give it a good blow job and the slot too).Check for any physical faults and place it back in.
If the same problem happens then open everything up and clean it all and plug it back in.
Hope this helps.
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