I have an HP n5415 running Windows xp home. Just recently the screen on the laptop would just go black, with no warning or error. The laptop does not turn off I can hear and see that the harddrive is doing its thing, the lights are still on, I can open the cd drive, etc. I have tried to hook it up to the desktop monitor and it does the same thing. I can not run any anti virus software because it goes black to quickly. Anyone have any thoughts? Thanks Bill