Screen is black, fan is blowing, can't restart!

I was doing some work on my iMac, walked away for 5 minutes and when I came back the screen was black and the fan is going full speed. If I hold down he power button it will turn off, but every time I try to start it up it stays black and only the fan come on (full speed). No chime when it comes back on. Any one else ever have this problem or know a solution before I haul the thing into to store?

Have you blown the dust out lately?
Let it cool for aqn hour or so with all power & periferals disconnected, try again.
Intel-based Macs System Management Controller (SMC)...
http://docs.info.apple.com/article.html?artnum=303319

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    com.apple.driver.AppleFWOHCI          4.7.3
    com.apple.driver.AirPortBrcm43224          428.42.4
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    com.apple.driver.AppleSmartBatteryManager          160.0.0
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    com.apple.driver.AppleACPIButtons          1.3.6
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    com.apple.driver.AppleHPET          1.5
    com.apple.driver.AppleSMBIOS          1.7
    com.apple.driver.AppleACPIEC          1.3.6
    com.apple.driver.AppleAPIC          1.4
    com.apple.driver.AppleIntelCPUPowerManagementClient          142.6.0
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    com.apple.nke.applicationfirewall          2.1.14
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    com.apple.driver.DspFuncLib          2.0.5f14
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    com.apple.driver.AppleProfileThreadInfoAction          14
    com.apple.driver.AppleProfileRegisterStateAction          10
    com.apple.driver.AppleProfileKEventAction          10
    com.apple.driver.AppleProfileCallstackAction          20
    com.apple.driver.AppleSMBusController          1.0.10d0
    com.apple.iokit.IOSurface          74.2
    com.apple.iokit.IOBluetoothSerialManager          2.4.5f3
    com.apple.iokit.IOSerialFamily          10.0.3
    com.apple.iokit.IOAudioFamily          1.8.3fc2
    com.apple.kext.OSvKernDSPLib          1.3
    com.apple.driver.AppleHDAController          2.0.5f14
    com.apple.iokit.IOHDAFamily          2.0.5f14
    com.apple.iokit.AppleProfileFamily          41
    com.apple.driver.IOPlatformPluginFamily          4.7.0a1
    com.apple.driver.AppleSMBusPCI          1.0.10d0
    com.apple.driver.AppleBacklightExpert          1.0.1
    com.apple.driver.AppleSMC          3.1.0d5
    com.apple.nvidia.nv50hal          6.4.0
    com.apple.NVDAResman          6.4.0
    com.apple.iokit.IONDRVSupport          2.2.1
    com.apple.iokit.IOGraphicsFamily          2.2.1
    com.apple.iokit.IOFireWireIP          2.0.3
    com.apple.driver.BroadcomUSBBluetoothHCIController          2.4.5f3
    com.apple.driver.AppleUSBBluetoothHCIController          2.4.5f3
    com.apple.iokit.IOBluetoothFamily          2.4.5f3
    com.apple.iokit.IOSCSIBlockCommandsDevice          2.6.8
    com.apple.iokit.IOUSBMassStorageClass          2.6.7
    com.apple.driver.AppleUSBMultitouch          207.7
    com.apple.iokit.IOUSBHIDDriver          4.2.0
    com.apple.driver.AppleUSBMergeNub          4.2.4
    com.apple.driver.AppleUSBComposite          3.9.0
    com.apple.iokit.IOSCSIMultimediaCommandsDevice          2.6.8
    com.apple.iokit.IOBDStorageFamily          1.6
    com.apple.iokit.IODVDStorageFamily          1.6
    com.apple.iokit.IOCDStorageFamily          1.6.1
    com.apple.driver.XsanFilter          402.1
    com.apple.iokit.IOAHCISerialATAPI          1.2.6
    com.apple.iokit.IOSCSIArchitectureModelFamily          2.6.8
    com.apple.iokit.IOFireWireFamily          4.2.6
    com.apple.iokit.IOUSBUserClient          4.2.4
    com.apple.iokit.IO80211Family          320.1
    com.apple.iokit.IONetworkingFamily          1.10
    com.apple.iokit.IOAHCIFamily          2.0.6
    com.apple.iokit.IOUSBFamily          4.2.4
    com.apple.driver.AppleEFIRuntime          1.4.0
    com.apple.iokit.IOHIDFamily          1.6.6
    com.apple.iokit.IOSMBusFamily          1.1
    com.apple.kext.AppleMatch          1.0.0d1
    com.apple.security.TMSafetyNet          6
    com.apple.driver.DiskImages          289.1
    com.apple.iokit.IOStorageFamily          1.6.3
    com.apple.driver.AppleACPIPlatform          1.3.6
    com.apple.iokit.IOPCIFamily          2.6.5
    com.apple.iokit.IOACPIFamily          1.3.0
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    USB Device: Built-in iSight, 0x05ac  (Apple Inc.), 0x8507, 0xfd110000 / 3

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