Asus N750JK Black Screen, No BIOS acces, no keys work

HI,

First please do try these troubleshooting steps listed below just skip those steps that you've already tried.

- First, connect your laptop onto an external display and see if you'll get any display from it. If you will, press the Windows key + P at the same time and select Computer Only or Disconnect Projector and see if you'll get the display back on the built in screen.
- If it will not work do a hard reboot, remove the battery and unplug it's AC adapter then press and hold the power button for 20 seconds then boot it back up and see if it will load normally.
- Next is to reseat the RAM if using a different AC adapter will not work. Remove them all for couple of seconds then put them back in making sure everything is seated properly.
- If these doesn't work, do check the AC adapter if it's supplying enough voltage or try another AC adapter that has the same voltage and see if it will boot up normally.
- And if all these steps will not make your PC boot up that means it's a problem with the motherboard.

Here's a video sample on how to reseat the CMOS battery of your laptop that should reset BIOS.
https/www.youtube.com/watch?v=-FxyV_2Jzz4