My buddy has a custom built PC with 16 gb ram, a gtx 2070, and a 850 watt power supply. He has 2 monitors and just the other day his secondary stopped working once windows boots. When he turns in his PC it shows the Asus splash screen of his motherboard (and bios if he wishes) however when windows starts loading usually blue screen with rotating white dots the second monitor shuts off. In windows itself under display settings it won't detect any other hardware except his main monitor. Windows and ALL drivers including graphics are up to date. I told him I couldn't diagnose without being there in person which I can't. Anyone got any ideas on a fix.