I've seen this pop up many times on this forum, the cause is Nvidia's latest graphic card drivers. The current one is 337.88, This driver is the cause to your G750 JM Driver Power State Failure. While I had this installed I probably got 2 to 3 BSOD a day. I doubt if that did any good for the system itself and I didn't want to lose things I was working on. As of now my current fix is to go to the asus software download page, and download version
VGA_nVidia_Win81_64_VER918133260 - I've had this laptop for 2 months now, and have been running Version V9.18.13.3260 . Its stable and I haven't seen any Power state failures. If you plan on installing this version, you must download it, and select CLEAN INSTALL., or custom install, and cant remember off hand. this version is 1 down from the newest driver. It was released on 2014.03.05 . The current driver is from 2014.07.04. Anyway, If anyone talks to asus or what not please let them know this info, also please let us know if you have heard anything about a fix coming from them! Hopefully a new NVidia driver will come out soon!
-Nick