I turned on my 2011 IMac and the fan is running very loud.  What is the problem?

Please help me figure out why my fan is running so loud after turning it on tonight.  I have shut it down and turned it on again and rebooted it and it is very loud.
Thank you.

timfrombrisbane and ScuseMe are right.
Apple engineers say, that to reset SMC, you follow the procedure outlined in KBase Article HT1379.
How much you've posted to the forums is irrelevant rkaufmann87. You're not one of the engineers who created the product.  The engineers who created the product, say to follow the steps outlined in that article HT1379.
The procedure you listed is incorrect and will not work to reset SMC on an iMac. Read the article. It's there in black and white, with very clear steps. As the article states, you have to unplug the power cable from the back of the machine, wait 15 seconds, plug it back in, then wait 5 seconds before turning it on. The article says nothing about holding the power button for 5 seconds.
People come in here, for computer science advice. I cited my source, for this scientific procedure. My source, is an article from the computer scientists who created the iMac product. I'm also an Apple certified repair technician - so I listen to what the Apple engineers say.
Can you cite your *official* source for your incorrect procedure? Didn't think so.

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              1 3.4 GHz Intel Core i7 CPU: 4 cores
              8 GB RAM
    Video Information:
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    Audio Plug-ins:
              BluetoothAudioPlugIn: Version: 1.0 - SDK 10.9
              AirPlay: Version: 1.9 - SDK 10.9
              AppleAVBAudio: Version: 2.0.0 - SDK 10.9
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                        Macintosh HD (disk0s2) /: 999.35 GB (698.05 GB free)
                        Recovery HD (disk0s3) <not mounted>: 650 MB
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              LSI Logic SYM13FW500-CDROM DRIVE 400mbit - 400mbit max
              Newer Technology, Inc. Oxford ATA Device 00 800mbit - 800mbit max
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                        disk3s2 (disk3s2) <not mounted>: 29 KB
                        disk3s3 (disk3s3) <not mounted>: 29 KB
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              Destinations:
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                   1%          WindowServer
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              3.50 GB          Active RAM
              778 MB          Inactive RAM
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