Not really a lockup, as the machine shuts off completely, no lights. It can be restarted, but just once, and only for a few moments. After that, it won't start for several minutes. This happens by itself or can be brought on by hand pressure on either the lower right or left corners, below keypad. Sounds like a heat problem to me but doesn't feel hot at all when it goes down. Computer repair shop had a look at it but couldn't solve it.
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