My laptop keeps on hanging and shutdown...

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I posted two months ago about my laptop re-heating and overwriting the BIOS password. So now, its already re-heated and overwrited but its still keeps on hanging and automatically shuts down. I returned it in repair shop and then they re-heated it again under warranty. When I use it again, the problem keeps coming back... So they said they will test the processor. They will replace a new one but I couldn't afford to pay for it... So if the problem is not in the motherboard, maybe its in the processor or in the circuit board... As of now, I don't know what else to do with my laptop... Help mylotters! First, of course! money is still a problem... But buying a new parts in a laptop is expensive...