I have a HP Compaq nc4200 laptop. I got it from a family member who no longer needed it, who got it from a sale of old office equipment, so it's at the very least third-hand, and somewhat battered. Today, I dropped it. It seemed unharmed at first, but the screen cuts out every few minutes (sometimes seconds), then fades back. Keyboard input also occasionally starts lagging, as does the mouse. It might be a coincidence, but, oddly, it seems as if, when the screen cuts out, it comes back sooner if I use the trackpad.

Is this something that I could fix? What might be causing it?