I have an HP Pavilion dv7-3165dx running Windows 7 Ultimate. It worked last night but tonight it shows nothing but a black screen. No cursor is blinking on screen. The computer starts up, mechanically, just fine. Lights are on, fans whirring, etc but nothing shows up on the screen, ever. I'm not able to run any diagnostic tests on the computer because I can't see if there are any options on the screen for me to choose in order to run them. I can't see to get into safe mode and this should give you a good idea of what I'm dealing with in trying to find a soiution to my problem. Do you have any ideas?