I have a laptop that when I boot it up, it will display a memory count, and allow me to enter th BIOS, a second later (after showing the key combo to enter BIOS) a loud solid beep occurs, then the screen turns black. The laptop is still booting, cuz I see the hard drive light going and hear sound. I have figured out that hitting the Fn+F4 key in combo will bring the screen back on, and the laptop is fine. When I restart or reboot, I need to hit Fn+F4 to get the screen back. Any ideas why?? and how to fix??? Thanks in advance!!