MB Fan revs up for 5 sec then shuts off?

The fan in my 2007 13" White MacBook revs up for a few sceonds then shuts off randomly. This just started happening recently. I did a clean install of Snow Leopard and did all the SW/FW updates. I ran Apple Software Diagnostic on it and Rember and it passed both. I also repaired permissions. I took the logic board out and replaced the thermal paste. I cleaned out the fans and vents with canned air. Checked all connections. I ran it on test RAM for a while and it happened so I dont think its the RAM.
Its completely intermittent and random. Unmistakable because the fan is revving at maximum and is really loud when it does this. Ive seen it do it when I wasnt running any apps so I dont think its app related. The machine seems to be functioning fine otherwise. Wondering if anyone is familiar with this issue or has any advice.
Thx!

i mistakenly wrote "clean" install of 10.6 and should have put "re" install of 10.6. i did not wipe the drive which ended up solving my issue. what a weird software issue. i was sure that it was a hardware thing.
i think it was some lingering istatpro or smcfancontrol files hiding somewhere deep in my OS. i deleted both of those apps a little while before this happened. after i deleted them i did do a SMC reset as required. this issue started happening soon after.

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All of a sudden this PC shut off and would not boot up.
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Try:
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Welcome to Apple Support Communities.
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Try:
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How to put iPod touch / iPhone into DFU mode « Karthik's scribblings
- If not successful and you can't fully turn the iOS device fully off, let the battery fully drain. After charging for an least an hour try the above again.
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- If still not successful that usually indicates a hardware problem and an appointment at the Genius Bar of an Apple store is in order.
Apple Retail Store - Genius Bar

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Bye

MB Fan revs up for 5 sec then shuts off?

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