i have a dell laptop with a screen that dont work, so i use a moniter. and i try to get to the screens before start up but they dont appear. when i hit f2 for bios or f8 for the screen to redo that hard drive the moniter screen stays blank and i have to shut down adn restart and it restarts normally, without the opening screens available before the startup. how can i get the laptop bios page to recognize my moniter screen instead of the laptop screen that is unreadable.