Fan is blowing very loud and hard

First time ever! I can actually feel the air blowing from behind the machine and boy is it loud...What gives? What should I do?

entrails wrote:
1. How do I know if I have an Intel Imac
2. What is SMC?
3. How do I reset it?
Thanks
1. Click the black Apple on the top left of your screen. Select 'About This Mac'  What does it say for 'Processor'?  If the word 'Intel' is there then you can proceed.  If not, let us know. 
2.  System Management Controller.  It controls power flow and fan speed.
3.  Click the following link to learn how to reset it   http://support.apple.com/kb/ht3964

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