I tried to attach two images to this posting but can't see if they appear properly in preview. This D820 with an Nvidia GPU and WUXGA screen displays a white band which doesn't change regardless of screen resolution, BIOS boot screen and diagnostic screen, Windows running, etc. I removed the keyboard, disconnected the VGA cable from the motherboard and reconnected, and there was no change.
Does this mean that this D820 finally remembered that it has an Nvidia GPU? Or might there still be some hope of repair?