I suspect this issue began when my laptop fell from a 2ft coffee table about 2 months ago.
My screen is now stuck on bright white with criss-cross vertical and horizontal lines. Before this, it started phasing from a normal screen to one with pink or green, with vertical stripes. The mouse did not move whilst it was phasing, suggesting (to me at least) that there was a temporary disconnection (now permanent) between the screen and the computer. The screen has never gone completely black, though.
I can (and could) temporarily restore a normal screen by giving the monitor repeated hard whacks on the left hand and right hand side (sometimes the top, but less normally), but the temporary fix lasts less and less time. Whacking the body of the laptop does not seem to make a difference.
I have taken the screen out of the laptop frame and have looked at the main connector at the back of it - it seems to be in flush/tight. There is a smaller connector on the right which is perhaps less firmly connected, but I presume that works for the webcam and microphone...
I would be grateful for any advice with what might have gone wrong. I'm not sure whether it is my screen which needs replacing, or the monitor cable (the silver/grey fabric-covered cable) that runs from the screen to the body of the laptop, or whether something else might have come loose (inside the body of the laptop?). It would be good to know whether I need to start buying parts.
If it is the cable that needs replacing, then I had thought the thread below would be relevant, but it does not seem to explain how to replace the cable (just the screen). Does someone have a link to a video which shows me how to replace the cable on something similar to an Envy 17?
http://h30434.www3.hp.com/t5/Notebook-Hardware-and-Upgrade-Questions/HP-Envy-17-White-Screen/td-p/3714144
Again, I'd be grateful for any help. Thank you very much for your assistance.