ODD and CPU fans running at high RPMs

Hello!
My iMac's ODD and CPU fans are running at unusual high speeds. If I turn the computer off and on they usually run at a normal rate but start rotating at around 3700 RPM very quickly (about 1-2 minutes after the OS X has started). The CPU load is not unusually high. The HDD fan is not affected.
I have tried SMC and PRAM resets multiple times.
27'' iMac - Mid 2010 (iMac11,3)
Intel Core i7 2,93 GHz
Boot-ROM-Version IM112.0057.B01
SMC-Version 1.59f2
Thanks!

For some reason the high fan RPMs had to do with having two desktops under mission control.

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I think you are referring to Target Disk Mode.
http://support.apple.com/kb/HT1661

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SMC is firmware and OS X is software, which has nothing to do. Furthermore, you are using a very old iMac, so SMC should not have been updated with OS X 10.10.2.
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https://support.apple.com/kb/ht1509
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Fans
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Follow these instructions again
https://support.apple.com/kb/HT3964
Next try a Safe Mode boot holding Shift key see if it continues.
Next create a new user and log into it, then log into it under Safe Mode
https://support.apple.com/kb/HT1455
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Do a Restoring OS X 10.5 10.6. 10.7 - simple overwrite OS method
https://discussions.apple.com/message/16276201#16276201
Check your Flash here and update
http://flashbuilder.eu/flash-player-version.html
Run a malware scan with the free ClamXav
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ODD and CPU fans running at high RPMs

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