Sorry, not a Mac issue, but I'm helping a friend. He has an HP laptop that completely freezes unless he presses down on it. It started out where he had to press firmly on the left of the trackpad. Then slowly went to the whole unit. Now he said he has better luck if he places something like a nut (not the kind you eat) under the middle of the laptop. Also, if he presses in the upper right corner it just shuts off. I opened the laptop once but could find nothing (and of course it worked fine when opened) Sounds to me like something is grounding. The computer completely freezes in whatever it is doing, then you squish it and it picks right up again. Everything was tight inside, I didn't see any grounding issues, and the case is plastic so that wouldn't affect grounding. Ideas?