I had a perculiar problem with my Dell Inspiron 9300 laptop. From one day to the other, the screen suddenly turned black after booting windows and before getting to the login screen.
The only way to get a login was to press F8 before booting and selecting "VGA mode".
Then I switched the normal device driver off (My Computer|Properties|Device Manager).
However, this did not solve my problem.
I found out there was a common problem with laptops in general that the "screen lid is closed switch" is stuck.
Furthermore it seems the Dell inspiron 9300 has a magnetic switch.
To remedy the problem I used a powerfull small magnet used to fix notes to a metal board. I searched for a place under the keyboard were the maget was repelled (tried with both sides). Then I rubbed the magnet repeatedly over this spot with the repelling side down.
Then the screen switched on again..
Hope this helps someone with a similar problem.