I turned my iMac on and the fan is so loud...never heard this before. any ideas?

I turned my iMac on and the fan is so loud...never heard this before. any ideas?

An SMC reset may fix it, although it may not prove to be a permanent solution:
http://support.apple.com/kb/HT3964?viewlocale=en_US&locale=en_US
If it re-occurs I'd suspect a failed sensor.

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