MSI B450 TOMAHAWK, AMD 2600, RAM 2X8 GSKILL TRIDENT Z 3200, GPU 1070 GIGABYTE. I WAS PERFORMING BIOS UPDATE THROUGH DRAGON CENTER. AFTER THE UPDATE FINISHED AND MY PC RESTARTED I HAD BLACK SCREEN. I REMOVED THE BATTERY AND I SHORT CIRCUIT THE PINS SO THAT I CLEAR CMOS.