There are several ways a lappie screen can malfunction.
If the light goes out but you can see the screen but dimly- this is an indication of a. backlight tubes blown or the inverter blown or a simple connection
If it is totally blank, but comes on intermittantly then is this a light and or data connection prolblem
Are you upto taking it to bits?
No! then into the repair shop it goes.
Buy a copy of MicroMart- all sorts of spares- repairers and all that suff - Comes out every Thursday in Smiths and other news agents