Fan comes on loud SMC restart didn't work

Hello,
I have a refurbished iMac and a while back the fan started acting up. It's barely a year old and there's nothing that sets the fan issue off that I can establish.
On startup sometimes the fan will come on and on really high, even with no applications on and I've tried the whole put it to sleep, restart it shut it down, unplug it for 15 seconds, wait 5 seconds, plug it back in restart.
This used to work, or sometimes on restart it just won't do the fan thing, sometimes for a few weeks the fan won't act up too.
I've tried many combinations of this also, I'll shut it down, unplug everything, plug it back in, I'll unplugg it, hold the button for 5 seconds, wait... plug it all back in.
I'm going insane and this started happening almost immediately after I purchased it, if it's broken, I wouldn't call it "refurbished" quite yet and I'd figure they wouldn't ship you something that hasn't been tested.
Any help is appreciated.
Thanks.

Also it sometimes takes a SMC Reset 3-4 attempts for it to work, don't give up after 1 attempt. Please closely follow the instructions in Intel iMac SMC and PRAM resets to learn how to do a SMC reset correctly on an Intel iMac.

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    com.apple.driver.AppleHDAController          2.2.5a5
    com.apple.iokit.IOHDAFamily          2.2.5a5
    com.apple.iokit.IOAudioFamily          1.8.6fc18
    com.apple.kext.OSvKernDSPLib          1.3
    com.apple.driver.AppleGraphicsControl          3.1.33
    com.apple.driver.AppleSMC          3.1.3d10
    com.apple.driver.IOPlatformPluginLegacy          5.0.0d8
    com.apple.driver.AppleSMBusPCI          1.0.10d0
    com.apple.iokit.IONDRVSupport          2.3.4
    com.apple.driver.IOPlatformPluginFamily          5.1.1d6
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    com.apple.driver.AppleUSBBluetoothHCIController          4.0.8f17
    com.apple.iokit.IOBluetoothFamily          4.0.8f17
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    com.apple.driver.AppleHIDKeyboard          160.7
    com.apple.iokit.IOUSBHIDDriver          5.0.0
    com.apple.driver.AppleUSBMergeNub          5.1.0
    com.apple.iokit.IOUSBMassStorageClass          3.0.3
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    com.apple.driver.AppleUSBComposite          5.0.0
    com.apple.iokit.IOFireWireSerialBusProtocolTransport          2.1.0
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    com.apple.iokit.IODVDStorageFamily          1.7.1
    com.apple.iokit.IOCDStorageFamily          1.7.1
    com.apple.iokit.IOFireWireFamily          4.4.8
    com.apple.iokit.IO80211Family          420.3
    com.apple.iokit.IOUSBUserClient          5.0.0
    com.apple.iokit.IONetworkingFamily          2.1
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    com.apple.iokit.IOSCSIParallelFamily          2.5.1
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    com.apple.iokit.IOUSBFamily          5.1.0
    com.apple.driver.AppleEFIRuntime          1.6.1
    com.apple.iokit.IOHIDFamily          1.7.1
    com.apple.iokit.IOSMBusFamily          1.1
    com.apple.security.sandbox          177.8
    com.apple.kext.AppleMatch          1.0.0d1
    com.apple.driver.DiskImages          331.7
    com.apple.iokit.IOStorageFamily          1.7.2
    com.apple.driver.AppleKeyStore          28.18
    com.apple.driver.AppleACPIPlatform          1.5
    com.apple.iokit.IOPCIFamily          2.7
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    Memory Module: DIMM 2, 4 GB, DDR3 ECC, 1333 MHz, 0x80AD, 0x484D54333531553742465238432D48392020
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