Oh, sorry to hear that, although I'm convinced it is something to do with your hardware, rather than X-Plane itself!
All I can suggest in terms of diagnosis, are the following:-
1. Try another HDMI cable
2. If you have one, try an alternative monitor
3. Download some 3rd party software from CPU User Benchmark and stress test your PC. Click on the following link to access the relevant website:- https://cpu.userbenchmark.com/Software
4. If all else fails, use the X-Plane Installer application, as this will scan all of your files to see if any are corrupt, missing or in need of update.
Very sorry, but remotely, there isn't much more that I can offer :-(