How to work the fan

everytime boot my laptop , the fan will work for a while, then stop.
even the coretemp rise over 90 degree celsius，the fan still not work. i have to reboot laptop.
my cpu is T2060, mainboard is 945GM.
how to resolve it ，thanks。

Startup your Mac while holding down the C key and inserting your install disc at the same time.
From there you should be able to use the Disk Utility app to repair the startup disk and reinstall OS X.
If that won't work, when you boot your Mac normally, if you do not hear the startup chime, that means your Mac has not passed it's startup diagnostics test. If that is the case, you need to take your Mac in for service.
Apple - Find Locations

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