Powers up but black screen

Left the aspire on running overnight while I was on ms word, woke up in the morning the screen was black. thought it was on standby, tried mouse pad and on button.

switched off completely and switched on again, fan goes on, but screen remains black
There are no covers in the battery compartment and the under side there is a small flap but when open there is nothing inside

For that you need to refix RAM memory.
It is in back side of laptop.
check in back side you find 1 plate upon battery open it then refix RAM memory.
if still same issue then you have to reset bios settings for that open back cover of laptop then find motherbord pull CMOS cell from motherbord for 10 minutes so all settings goes to factory defaults.
Then check.
Let me know if you need more assistance.
Thanks.