Hi . I have a problem with a gtx 780 GB GV-N780OC-3GD. It stopped abruptly in video applications, no longer loading menus, nothing (BF4, WOT).The card works ,fans spin. It belongs to a friend.. The system on which it is mounted is an i72600k, non oc, GB GAZ68x-ud3h-B3,16 gb Corsair 1866 MHz motherboard , PSU-Corsair CX750.Win 10 Pro-21h2-build19044.1586. X mp is not on. Initialy the system had problems, the programs did not respond, the drivers were not updated correctly so i decided to reinstall win. This was done on a Samsung evo 250 GB. Everything was ok until loading win where it loses video signal and never returns back.Display port no, HDMI no, onboard GPU works, dedicated no signal after boot while loading win. I installed the board in my system with the same result. The system works but the video signal disappears. After about a minute everything resets and win starts to enter repair mode even resulting in disk error on both systems. Both systems have Win 10 Pro installed,same versions. Bios was set to default settings and on his MB ,the battery was removed as well with no result. Opinions ? Thanks.