Hi,
I can only suggest a very good internal clean of all fans and contacts. If you can dismantle the machine without doing any damage, then strip it to the bare shell and clean anything and everything you can get to. If you can run the machine in this state, try, and apply slight pressure on different points of the motherboard as it boots. There may be a simple bad connection that is connected when the machine is held in a different way. The fact that it will start (1 in 50) shows that everything works sometimes, but to find what is not working (49 in 50) could be very hard. I would suggest a service tech or buy another.
Bob_180_Bob
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