Grey screen, no lights but fans spin ( can’t boot up)

[Microsoft Windows]

My partner has broken his pc, he has an igpu which he attempted to disable in device manager as he has a dedicated gpu, which caused a black screen, he turned the pc off and went into the bios to force it back on. I realised he had his hdmi plugged into his mb/igpu we switched that to the graphics card port and put the internal graphics back to auto, booted up the pc and it ran fine - with the screen having better quality, he played a game of cod and when he tabbed out he noticed an invisible box on his screen. After some googling, it said to restart the windows explorer process, which he did

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