My notebook display screen is suddenly so dark I can barely see it. Have tried to adjust brightness, reinstalled display adapter, run hardware diagnostics, tried system recovery & Roxio Go-back. I guess it could be the backlight that's gone bad. I can use an external monitor with no problem, so don't think it's a driver\video card problem. Of course it's out of Warranty. It is an HP Pavilion XH555, AMD 1.2 G processor, 512 Ram running Win XP Home Edition. Any ideas? If it's backlight, can I replace myself? Where to get parts? Or, what other suggestions does anyone have? (Replacement screen is going to cost around $800, so need to get fixed instead of replaced. Thanks for any ideas.