IMac cannot handle Mavericks and external display?

I am a long-time apple-user and long-time user of this wonderful forum. This is, however, the first time I have needed to ask a question of my own having been unable to find an answer on here or elsewhere. In fact, I haven't read of anyone experiencing the issues that I am.
I recently purchased a second hand Apple iMac "Core 2 Duo" 2.0 20-Inch (Al) to replace my old white one. I understand that this is the oldest iMac to be able to handle Mavericks, but I have upgraded the RAM to 4GB just to be safe. I also bought myself a lovely HP W2207H Monitor that is HDMI input and, when on Snow Leopard before my upgrade yesterday, was a beautiful extended desktop with no issues whatsoever.
Since upgrading to Mavericks, the monitor has not been working properly; but it's not any of the other, well-documented issues that I have read already. The monitor doesn't flicker, it is recognized beautifully and the resolution is spot on the native...
Right now, for instance, the monitor is working fine. However, if I was to open a new Firefox tab, or open a new application on my iMac, the monitor would go black (not to sleep or shutting down as the light remains on) for two seconds or so. It seems as if the iMac is struggling with doing something and therefore cuts the monitor feed whilst it's doing the process I have just requested. Furthermore, the iMac's fans are running quite hard despite activity monitor showing the decreased usage as Mavericks promised!
For your information: Apple iMac "Core 2 Duo" 2.0GHz 20-Inch (Al) 4GB RAM connected to HP W2207H by Mini-SP to HDMI adaptor and HDMI Cable.
I wonder if anyone could help me solve this problem on Mavericks, or will I simply need to regrade down to Snow Leopard for optimal performance of the external display?
Many thanks in advance,
Mike

hey.. the display starts up with the imac...
I'm having trouble adusting the brightness on my cinema display...
hopefully get a answer today.. I have a 24" imac

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    com.parallels.virtualsound          1.0 22731.929773
    com.Logitech.Control Center.HID Driver          3.4.0
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    com.apple.driver.AppleHWSensor          1.9.5d0
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    com.apple.iokit.IOBluetoothSerialManager          4.2.0f6
    com.apple.driver.AGPM          100.14.11
    com.apple.driver.ApplePlatformEnabler          2.0.9d1
    com.apple.driver.X86PlatformShim          1.0.0
    com.apple.driver.AppleMikeyHIDDriver          124
    com.apple.iokit.IOUserEthernet          1.0.0d1
    com.apple.driver.AppleHDAHardwareConfigDriver          2.5.2fc2
    com.apple.driver.AppleHDA          2.5.2fc2
    com.apple.iokit.IOBluetoothUSBDFU          4.2.0f6
    com.apple.driver.AppleUpstreamUserClient          3.5.13
    com.apple.driver.ACPI_SMC_PlatformPlugin          1.0.0
    com.apple.iokit.BroadcomBluetoothHostControllerUSBTransport          4.2.0f6
    com.apple.driver.AppleThunderboltIP          1.0.10
    com.apple.driver.AppleIntelHD4000Graphics          8.1.8
    com.apple.driver.AppleMikeyDriver          2.5.2fc2
    com.apple.driver.AppleSMCLMU          2.0.4d1
    com.apple.Dont_Steal_Mac_OS_X          7.0.0
    com.apple.driver.AppleMuxControl          3.4.12
    com.apple.GeForce          8.1.8
    com.apple.driver.AppleBacklight          170.3.5
    com.apple.driver.AppleMCCSControl          1.1.12
    com.apple.driver.AppleLPC          1.7.0
    com.apple.driver.AppleHWAccess          1
    com.apple.driver.AppleSMCPDRC          1.0.0
    com.apple.driver.AppleIntelFramebufferCapri          8.1.8
    com.apple.nvidia.NVDAStartup          8.1.8
    com.apple.driver.AppleUSBTCButtons          240.2
    com.apple.driver.AppleUSBTCKeyEventDriver          240.2
    com.apple.driver.AppleUSBTCKeyboard          240.2
    com.apple.driver.AppleFileSystemDriver          3.0.1
    com.apple.AppleFSCompression.AppleFSCompressionTypeDataless          1.0.0d1
    com.apple.AppleFSCompression.AppleFSCompressionTypeZlib          1.0.0d1
    com.apple.BootCache          35
    com.apple.driver.XsanFilter          404
    com.apple.iokit.IOAHCIBlockStorage          2.4.0
    com.apple.driver.AppleUSBHub          650.4.4
    com.apple.driver.AppleSDXC          1.4.0
    com.apple.iokit.AppleBCM5701Ethernet          3.6.9b9
    com.apple.driver.AirPort.Brcm4331          700.20.22
    com.apple.driver.AppleAHCIPort          2.9.5
    com.apple.driver.AppleUSBEHCI          650.4.1
    com.apple.driver.AppleUSBXHCI          650.4.3
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    com.apple.driver.AppleRTC          2.0
    com.apple.driver.AppleACPIButtons          2.0
    com.apple.driver.AppleHPET          1.8
    com.apple.driver.AppleSMBIOS          2.0
    com.apple.driver.AppleACPIEC          2.0
    com.apple.driver.AppleAPIC          1.7
    com.apple.driver.AppleIntelCPUPowerManagementClient          216.0.0
    com.apple.nke.applicationfirewall          153
    com.apple.security.quarantine          3
    com.apple.driver.AppleIntelCPUPowerManagement          216.0.0
    com.apple.kext.triggers          1.0
    com.apple.iokit.IOSerialFamily          10.0.7
    com.apple.iokit.IOBluetoothFamily          4.2.0f6
    com.apple.driver.DspFuncLib          2.5.2fc2
    com.apple.vecLib.kext          1.0.0
    com.apple.iokit.IOAudioFamily          1.9.4fc11
    com.apple.kext.OSvKernDSPLib          1.14
    com.apple.driver.IOPlatformPluginLegacy          1.0.0
    com.apple.iokit.IOBluetoothHostControllerUSBTransport          4.2.0f6
    com.apple.iokit.IOSurface          91
    com.apple.driver.AppleGraphicsControl          3.4.12
    com.apple.driver.X86PlatformPlugin          1.0.0
    com.apple.iokit.IOAcceleratorFamily          98.7.1
    com.apple.nvidia.driver.NVDAGK100Hal          8.1.8
    com.apple.driver.AppleThunderboltEDMSink          1.2.1
    com.apple.driver.AppleThunderboltDPOutAdapter          2.5.0
    com.apple.driver.AppleBacklightExpert          1.0.4
    com.apple.driver.AppleSMBusController          1.0.11d1
    com.apple.driver.AppleSMC          3.1.6d1
    com.apple.driver.AppleSMBusPCI          1.0.12d1
    com.apple.nvidia.driver.NVDAResman          8.1.8
    com.apple.driver.IOPlatformPluginFamily          5.5.1d27
    com.apple.driver.AppleHDAController          2.5.2fc2
    com.apple.iokit.IOHDAFamily          2.5.2fc2
    com.apple.iokit.IOAcceleratorFamily2          98.7.1
    com.apple.AppleGraphicsDeviceControl          3.4.12
    com.apple.iokit.IONDRVSupport          2.3.6
    com.apple.iokit.IOGraphicsFamily          2.3.6
    com.apple.driver.AppleThunderboltDPInAdapter          2.5.0
    com.apple.driver.AppleThunderboltDPAdapterFamily          2.5.0
    com.apple.driver.AppleThunderboltPCIDownAdapter          1.4.0
    com.apple.driver.AppleUSBMultitouch          240.6
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    com.apple.driver.AppleUSBMergeNub          650.4.0
    com.apple.driver.AppleUSBComposite          650.4.0
    com.apple.iokit.IOFireWireSBP2          4.2.5
    com.apple.iokit.IOFireWireFamily          4.5.5
    com.apple.iokit.IOSCSIBlockCommandsDevice          3.6.0
    com.apple.iokit.IOSCSIArchitectureModelFamily          3.6.0
    com.apple.driver.AppleThunderboltNHI          1.9.2
    com.apple.iokit.IOThunderboltFamily          2.8.5
    com.apple.iokit.IOEthernetAVBController          1.0.3b3
    com.apple.driver.mDNSOffloadUserClient          1.0.1b4
    com.apple.iokit.IO80211Family          600.34
    com.apple.iokit.IONetworkingFamily          3.2
    com.apple.iokit.IOUSBUserClient          650.4.4
    com.apple.iokit.IOAHCIFamily          2.6.0
    com.apple.iokit.IOUSBFamily          650.4.4
    com.apple.driver.AppleEFINVRAM          2.0
    com.apple.driver.AppleEFIRuntime          2.0
    com.apple.iokit.IOHIDFamily          2.0.0
    com.apple.iokit.IOSMBusFamily          1.1
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    com.apple.kext.AppleMatch          1.0.0d1
    com.apple.security.TMSafetyNet          7
    com.apple.driver.AppleKeyStore          2
    com.apple.driver.DiskImages          371.1
    com.apple.iokit.IOStorageFamily          1.9
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    com.apple.driver.AppleFDEKeyStore          28.30
    com.apple.driver.AppleACPIPlatform          2.0
    com.apple.iokit.IOPCIFamily          2.8
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    com.apple.kec.corecrypto          1.0
    com.apple.kec.pthread          1

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        Currently owning 2 desktop PCs. Looking at switching to Mac
        Currently owning 2 desktop PCs. Looking at switching to Mac
        Currently owning 2 desktop PCs. Looking at switching to Mac

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