PC crashed, now one of two monitors won't display

ec08 · September 27

I recently took my pc to microcenter and they couldnt find anything wrong with it so I took it home and started playing some games. It worked for a day and then today it again started crashing like usual. This time though, the whole PC crashed and rebooted. When it rebooted, one of the monitors started to artifact and then went black and when I signed in the PC then crashed again on boot. This time, it tried doing some memory check and then went to login screen like usual but the left monitor did not work at all. I tried swapping the cables and still the left display is not showing anything. I have an extra monitor so I changed out the left monitor for another one and again its not displaying anything on there. I tried again just in case changing the cables and still only the right monitor is working. I've taken it for diagnostics now three time so I am almost sure its not a PSU, GPU, CPU, or motherboard issues as they have never found anything and they have updated the drivers and just to be sure I also used DDU to updated the drivers. Also updated windows and flashed the BIOS. Losing ideas for what it could be and they have yet to really find anything that fixes it in store.
Edit: after crash, the GPU got disabled. Had to manually enable in the device manager. I still dont know what is causing the frequent crashes though