I would require some information in order to fix your computer issue:
1. Any recent software or hardware changes in your computer?
2. Any recent windows updates installed on your computer?
3. When you started facing this issue?
4. System model and Operating system of your computer?
I hope you tried installing Graphic drivers of your system and tried changing the resolution, if not please do so as this should fix the issue. If the issue still persists then you can try doing System Restore to a date when your system was working fine.
Kindly get back if there are any further queries.
Thanks & Regards