My iMac sounds terrible!  There's like a loud fan or motor running?

Hello,
My iMac sounds like a plane taking off!  I will have to confirm what version of OS I am running but does anyone else have this issue?  Is it the fan or is it a hardware issue?  It has become a little slower over the last couple of months and it's only 8 months old!
Please help!

Problems related to unexpected system sleep, shutdown, lights or fans call for an SMC reset:
Resetting the System Management Controller (SMC)
Resetting the SMC for Mac Pro, Intel-based iMac, Intel-based Mac mini, or Intel-based Xserve
Shut down the computer.
Unplug the computer's power cord.
Wait fifteen seconds.
Attach the computer's power cord.
Wait five seconds, then press the power button to turn on the computer.

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