I have a Pavilion DV6-2066dx. When I power up, I end up at a black screen with either the LED numlock light staying on solid or, the caps lock light and num lock light flash twice. I had it unplugged and powered off for months. When I plugged it in, I saw the HP logo, startup screen then scrambed info. Now, it's back to a black screen and flashing lights. I tried removing the memory, hard drive, resat the memory and have the same issues. I connected an external monitor and there's no display on it.
Specifics on booting: I hear the fan, the LEDs flash normally, I hear the CD/DVD get selected (but it won't boot from a boot disk), end up with a black screen and LED issue (either solid numlock LED or flashing numlock and caps lock in a sequence of two flashes, pause, two flashes).