Laptop Problems, HELP!!

what make is your notebook and how old is it?
you don't give much information if I may say so.

anyway, on my older notebook I had a similar problem.
in my case all I had to do is close and open the display once or twice. apparently the BIOS didn't read the small pin properly that switches the display off when you close it.
maybe your BIOS finds a problem during the BOOT process and can't initialize the graphics card or the display cables are worn out by the open/close of the dispaly. happens more often then you might think. check this by connecting a monitor to the vga port. if you get a picture there but not on the LCD it might be the internal connection to the display. but make sure that in the BIOS the output on both screens simultaneously is enabled.

respect!

sounds like it could be that your HD is developing faults since you say it happens mostly after windows crashed.
ever checked with ScanDisk (the full check that includes surface errors)?
I lost two notebook HDs so far due to bad sectors. even though they are build to survive quite some movement and shock, they are not indestructable.
if possible reinstall windows clean. means to format the c: partition. usually bad sectors are marked during format and won't be used by the system then. but as I said only if possible.

respect!