Black Screen on Toshiba Satellite/Not working

Hi all,
Wondering if anyone had a solution. I have a Toshiba Satellite L875-S7110. Never had a problem with it until yesterday. Laptop was on, I closed it, put it in my car to go to work (no case so there was nothing obstructing airflow) and when I got to work and opened it, completely black screen.
Shut it off, turned it back on, still a black screen. There's no backlights, no lights on the caps lock or num lock.
I've scowered the internet for multiple fixes; I've tried taking the battery out, holding the power for 30 seconds, reattaching the power cable, etc. and nothing has worked. I've taken the RAM out and put it back in, nothing.
The lights are on for the power/HD drive, the CD drive will open and you can hear the fans running/the computer running. Tried putting it on an external display but the displays all say no signal.
Any ideas/solutions for what this might be or how to fix it? 
Thanks!

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- Peter

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