Exactly the same with Asus N61Ja with HD 5730. Tried 13.12 and 13.11 beta 9.95 on Windows 7x64 and Linux 3.12.8 x64. LCD screen is black just after the driver module is loaded. External monitor via VGA D-sub works fine. No errors, no warnings. Will try switch for 13.9 now.
There are quite a few threads about that. Asus seems to be the problem. External monitors work fine, laptop screen stays black. Fill out a issue report form and send it like all the rest of us. Roll back to the drivers you had before..or try the new 13.30 beta.