mine had black screen on startup but hdmi worked, Fixed it with a hard reboot and setting bios to default. to hard reboot unplug everything and take the battery out, then hold the power button for 30 seconds. then plug in only the power cord and st...
another post says it might be incompatible windows update. turn off windows update, restore to back when it was working then do updates manuly till you find the one causing the problem and don't install it
