Acer Laptop Will Not Start Black Screen No Bios

My laptop is a Acer aspire 5738z running windows 7 home premium 64 bit and my problem is my laptop will not start. When I turn my laptop on it starts to run like normal: GPU fan starts, Disk drive kicks in, and the LED for the on button is working but nothing on the screen. I've tried too do alt + f10 for a restore, nothing happened. I've also tried to plug it into a monitor and my tv. Before this occurred it had been turned off during boot (don't ask why, I cannot answer that) and I preceded to take it apart(to fix the overheating issue due to acer not putting fan holes on the bottom of the laptop ((thanks Acer -.-)) and I didn't realise something was wrong with it until I reassembled it and tried to turn it on. So I'm not sure whether is corrupt BIOS, a hardware problem, or corrupt MBR (my own personal diagnosis, don't know whether it's right or not). Also I have tried turning the laptop off taking the battery out letting the motherboard discharge then pressing the power button for a minute, leaving it for a minute, putting the charger in then turning it on.

 

Hi and welcome to CHF

If you had an "overheating issue " then this would cause your machine to shut down.

You took the machine apart - how far did you get ?
Laptops are not easy to work on.

You say you didn't realise something was wrong until you re-assembled it.
Surely there was the overheating and shutting down issue ??

If you look very closely at the screen can you make out the graphics - barely visible ?

Have you tried Safe Mode ( tap F8 after switching on )