Service tag · 4 matching pages
Diagnose a computer that has power but no usable image by separating monitor, cable, input, laptop-display, graphics, boot, memory, and deeper hardware causes before assuming the motherboard or screen is dead.
Diagnose a previously working second display by checking monitor power and input, cable and port combinations, Windows display detection, dock or USB-C capability, driver changes, and whether one hardware output has failed.
Diagnose intermittent flicker or brief black screens by first determining whether only the image disappears or the whole computer freezes, then checking cables, displays, refresh settings, drivers, docks, heat, power, and GPU behavior.
Diagnose sudden size changes by identifying whether the whole desktop, one display, one browser, or one application changed, then checking native resolution, Windows scaling, per-display settings, and app zoom.