IMAC G5 fans running at high RPM

Hello,
I have a 20" G5 iMac and just had the motherboard replaced under warranty. Since the replacement my fans will start to run at very high rpm's fr no reason. It will happen even when the computer is not being used and no applications are running. It is currently at:
CPU 122 degrees
CPU fan 2996 rpm
HD 124 degrees
HD fan 4178 rpm
System fan 3098 rpm
I have called applecare and they had me do several resets which seemed to help for about 1 hour and then the fans have ramped up and not gone down in the past hour. This last time I was watching TV and heard a noise from the computer and low and behold it was the fans. Nobody was working on the computer and all apps were closed. I bought this computer in September 2005 and have had 2 lcd's replaced and a logic board replaced. I am getting frustrated with this, my first, Apple computer. Does anyone have an idea of why the fans are running so high? I never had a problem like this with my old logic board.

Have you looked in Activity Monitor to see if any applications are causing the fans to run? Applications/Utilities/Activity Monitor.

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        APPLE SSD SM0512F disk1 : (500,28 GB)
            EFI (disk1s1) <not mounted> : 210 MB
            Macintosh SSHD (disk1s2) / : 499.42 GB (251.32 GB free)
            Recovery HD (disk1s3) <not mounted>  [Recovery]: 650 MB
        Samsung SSD 840 EVO 750GB disk0 : (750,16 GB)
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        Apple, Inc. Keyboard Hub
            Apple Inc. Apple Keyboard
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        Apple Inc. thunderbolt_bus
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        Anywhere
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            /Applications/Toast 11 Titanium/Spin Doctor.app
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            /Users/[redacted]/Library/Services/ToastIt.service/Contents/MacOS
        [not loaded]    com.roxio.TDIXController (2.0) [Click for support]
    Startup Items: ℹ️
        ProTec6b: Path: /Library/StartupItems/ProTec6b
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    Launch Agents: ℹ️
        [not loaded]    com.adobe.AAM.Updater-1.0.plist [Click for support]
        [loaded]    com.adobe.CS5ServiceManager.plist [Click for support]
        [running]    com.symantec.uiagent.application.plist [Click for support]
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        [loaded]    com.adobe.SwitchBoard.plist [Click for support]
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        [loaded]    com.adobe.AAM.Updater-1.0.plist [Click for support]
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        Flip4Mac WMV  [Click for support]
        Growl  [Click for support]
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