I have an ASUS x750ja laptop running Windows 8.1.

The problem: From startup (including bios logo), the screen briefly displays what it should, then goes black. Bios logo, then black. If I enter the bios, it goes black at the first screen. It'll flash the Windows logo, then go black.

I've hooked it to a secondary monitor via HDMI. It seems like a hardware error, but whenever the monitor gets a signal to refresh, it flickers back on. For example, when I have it hooked to the external display, and configure it to extend the display, the laptop screen turns on for a second.

Furthermore, the brightness keys still function.