MacBook hangs then shuts off

During the startup process my MacBook freezes (start chime comes up and booting begins). Some seconds later it will shut off. When I try to restart the MacBook it turns off immediately. I suppose, that it overheats though the fan is running slowly. Does anyone know how to check the temperatures and/or the thermal sensors? Or maybe there's some other problem? Please give me a hint.

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It doesn't have time to overheat. Try resetting the SMC: http://support.apple.com/kb/HT3964

then zap the PRAM: http://support.apple.com/kb/ht1379

Let us know of anything else it may be doing after you try these fixes.

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Hello mayer,

it tried resetting the SMC and the PRAM but it didn't work.

I also replaced the standard HDD by a SSD I use in my own MacBook and discovered the following:

- The MacBook boots up and may be used about five minutes before it freezes again. It doesn't shut off after it froze. Cooling the computer down in a fridge to make it run again didn't work. It takes several hours to be able to get the system booting again.

- I also tried running a benchmark software (cinebench) and discovered that the CPU temperature rose to 107°C before the computer switched off. I noticed that while the temperature was rising the CPU fan didn't speed up.

I hope that my descriptions help getting a better understanding of the system's behavior.

Greetings. Joerg.

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Try iStat Pro to get temperatures:http://www.islayer.com/apps/istatpro/

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It's no longer possible to boot the system up. Each time I press the power button the white light turns on, the fan speeds up shortly and after some seconds the system shuts off. Again some seconds later the system powers on again without pressing the power button, the fan speed up again shortly and the light remains on until you press the power button for about four seconds.

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Joerg Hildebrand will be eternally grateful.
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