Can't boot computer in normal mode

[Galactra]

My brother was on his computer when it suddenly crashed. He said there were grey boxes on the screen and then it shut off and on his monitor displayed an error message about the input resolution, so we thought it was a monitor issue. However he has his computer connected to his tv as well and tried to boot it up again. When it gets to the windows screen (with the colored balls spinning) the screen goes black. We are only able to boot it up in safe mode. Any help would be appreciated.

 

[Cycloid Torus]

Since I am sure you have a 'clean' machine and have run a good AV and Anti-malware, then most likely it is a video sub-system problem.

Remove all overclocking.

Check Device Manager to confirm that it identifies video card properly.

Remove card and inspect for any damage (brown or black marks).

Confirm heatsink is properly attached (else could be overheat).

Confirm all connections are snug.

Power up and confirm fan on video card is spinning.

If all above are 'OK' yet still having issue, it could be a corrupted driver - use DDU to remove old driver and download fresh version of driver from nVidia/AMD. ( https://www.techspot.com/drivers/driver/file/information/17830/ )

If still having problems, it is most likely a failing video card so try video card in another system.

If you are still under warranty, go to maker's website and obtain an RMA (Return Merchandise Authorization) from Support - they may have solutions, so follow directions carefully.