Model A1174 with 2 GHz Core Duo or Model A1207 with 2.16 or 2.33 GHz Core 2 Duo

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Turn off by it self,and won't turn on.

When use the mac for half a hour,it will turn off by itself, and should waiting for one hour or more,can turn it on.

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At first ,i thought it will be overheating,after i checked everything,no overheating.and today i checked the power supply, that has problem.thank you everybody.

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Sounds like something is overheating and shutting you down. Take the cover off and observe the diagnostic LEDs to the right of the RAM slots (this may be covered by a piece of black electrical tape). Jason may be right about the power supply, if so none or just the first LED will remain on after it shuts down.

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It's hard to say based on the info you have provided, but I think you need to replace the Power Supply. You should do all of the normal tests such as resetting the SMC/SMU, reset the PRAM, and remove and reseat/replace the RAM. HTH. :)`

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