Laptop wont start

[be-human]

Hello al
What could be the issue of this acer 5552g laptop.
After I turn the laptop off, it won't start immediately. I press the power button I hear the it looks for the dvd but the screen is totally black (not powered black).
After some 20 to 30 minutes it starts again. I entered the bios after one of these attempts and it freezes. Keyboard is not working, I can not even quit bios.
Or it will show the windows 7 startup for ever. It hangs there.
Any help would be greatly appreciated.

 

[velo3100]

It could be that your laptop is full of dust and needs cleaning and you need to sort out your cable that is connecting to the screen.