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Could be a million things, but seeing that it turned itself off while in use, and then would only turn on again after a long wait, I'd check if the cpu fan is working properly.
Most motherboards monitor heat buildup and/or fan speed and will shutdown automatically to prevent damage. You try to turn it on and it wont because its still too hot, but leave it a while and then it works again.
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If you always do what you've always done, you'll always get what you've always gotten
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