I am sorry to hear that you're having problems with your laptop. Laptops are definitely more "touchy" than their desktop counterparts, that's for sure. We've had a lot of problems with the IBM Thinkpad line (all the way back to the old T-21 days) where the memory sockets themselves would work themselves loose. The reason(s) for this is on account of the fact that IBM, as well as the rest of the industry, insist on using surface mount technology -- we've found that if a user picks up his or her laptop up by a corner, it causes the case to flex somewhat. What happens when the case flexes? The moutherboard will flex somewhat with it. Well, the memory sockets can only take so much of that before they work themselves loose. I've seen this firsthand.
Also, it's a good idea to open your screen with both your hands, one on each side of the screen, and open it slowly. Never open up a laptop screen by one corner, you'll put strain on the hinges which will eventually lead to a problem - this tip is especially good for those who use the older IBM Thinkpad models. It seems as if the newer models (T40 and upwards) don't suffer from this issue as much.
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