What's the best way to check whether my GPU is failing? It seems to suffer from something mysterious. Last year, a few times, maybe 4 - 5, always at least 1 - 3 months between occurrences after booting the PC I was met with corruption - black squares and stuff like that appearing on the monitor RIGHT after logging into Windows. If it did not start right after logging into Windows then it would not happen for the duration of that session. Rebooting would fix this. During this time I've tried furmark, occt vram test, unigine superposition, heaven etc. Nothing. No errors or corruption. Then I updated to Windows 11 this January and literally nothing at all happened for 8 months of browsing the web, playing games even on demanding emulators until the day before yesterday when I had a mysterious BSOD (please check my previous post for the minidump file) while browsing with Firefox. Today, again while browsing on Firefox, the monitor flashed green for a split second. Event viewer didn't log any error for this flash. What gives??? What should I do (which tests should I run and for how long)? Thanks..