Black screen on laptop~ how to CD boot?

My girlfriend's HP laptop won't boot~ fan is on, lights on keyboard on but has a blank black screen.
Have done the standard hard reset, tried to see if there was anything displayed using a separate monitor..... nothing.
Is there any way of using a recovery disc to boot from disc drive when the screen is black? In other words ordinarily you would mash 'Delete' button or whatever key your computer brand uses, then you get option to actually change boot order on screen, but with the black screen problem on a laptop you can't see anything!
Any helpful replies appreciated


Mostly Harmless
Staff member
That might be a corrupt EFI, it won't even let you POST. Usually manufacturers have some sort of secret key combo that can be used to force a reset of the UEFI.