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sounds like low on resources or maybe video mem went bad
also overheating could be source of a problem.
for resources check in task manager, see used memory against physical memory, if used more than you have phisically - reboot and/or kill some processes.
if that didn't help or system resources are ok, open your box check if all fans work alright and not dusty.
if non of the above then take to technician, could be video card or something else.
doubt that monitor can be cause of it.
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