Getting a black laptop screen
Solution 1:
That is a tough one -- if it was a desktop machine I would recommend
- resetting the BIOS
- trying a different video card (if available)
But as a laptop your troubleshooting options are .. more limited. You've tried booting with external video devices which is about all I can think of!
You may want to give ASUS support a call on this one; hopefully it is under warranty?
Solution 2:
What happens if you boot off a live CD? Like a live Linux CD? Or a USB memory stick? This may be nearly impossible if your BIOS is configured to boot from CD after booting from the hard drive... But it's just a thought.