IMac output to Plasma suddenly darker

Hi guys,
Can anyone help with this problem?
I have had my iMac 20" Display output connected to our Panasonic 37" Plasma for 18 months now with no problems at all, then the other day I put the TV to the Computer and the picture was very dark with skin colour very red. I haven't touched any settings on the TV or the iMac (I don't think anyway) up until this point. Messing with the TV picture and Computer settings doesn't bring the picture back to it's original clarity and I can't seem to find anything on the iMac that can help.
Hoping someone can help
iMac 20" 2.66GHz 4GB RAM Leopard 10.6, Panasonic TH-37PX70B Plasma linked with 15 Pin D-sub iMac output set at 1152 x 870 (Since 18 months ago)
Many thanks
Matt

There's been a lot of similar sounding complaints lately stemming from a recent update. The solution in those cases has been to go into Displays Preferences and start a color calibration. When you get to the part about the gamma setting, switch it from 2.2 to something lower. Usually 1.8 has done the trick.

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Hardware Information:
          iMac (24-inch, Early 2008)
          iMac - model: iMac8,1
          1 3.06 GHz Intel Core 2 Duo CPU: 2 cores
          4 GB RAM
Video Information:
          NVIDIA GeForce 8800 GS - VRAM: 512 MB
System Software:
          OS X 10.9.2 (13C64) - Uptime: 0 days 0:56:41
Disk Information:
          ST3500418AS disk0 : (500.11 GB)
                    EFI (disk0s1) <not mounted>: 209.7 MB
                    Macintosh HD (disk0s2) / [Startup]: 499.25 GB (415.73 GB free)
                    Recovery HD (disk0s3) <not mounted>: 650 MB
USB Information:
          Iomega External HD 1 TB
                    EFI (disk1s1) <not mounted>: 209.7 MB
                    Media (disk1s2) /Volumes/Media: 999.86 GB (626.31 GB free)
          Hewlett-Packard HP Color LaserJet CP1518ni
          Apple Inc. Built-in iSight
          Apple, Inc. Keyboard Hub
                    Mitsumi Electric Apple Optical USB Mouse
                    Apple Inc. Apple Keyboard
          Apple Inc. BRCM2046 Hub
                    Apple Inc. Bluetooth USB Host Controller
          Apple Computer, Inc. IR Receiver
FireWire Information:
Thunderbolt Information:
Kernel Extensions:
          com.logmein.driver.LogMeInSoundDriver          (1.0.3 - SDK 10.5)
          net.telestream.driver.TelestreamAudio          (1.0.5 - SDK 10.6)
Startup Items:
          ColdFusion10: Path: /Library/StartupItems/ColdFusion10
Launch Daemons:
          [System] com.adobe.fpsaud.plist 3rd-Party support link
          [System] com.barebones.authd.plist 3rd-Party support link
          [System] com.barebones.textwrangler.plist 3rd-Party support link
          [System] com.google.keystone.daemon.plist 3rd-Party support link
          [System] com.logmein.logmeinblanker.plist 3rd-Party support link
          [System] com.logmein.logmeinserver.plist 3rd-Party support link
          [System] com.logmein.raupdate.plist 3rd-Party support link
          [System] com.macpaw.CleanMyMac2.Agent.plist 3rd-Party support link
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          [System] com.adobe.AAM.Updater-1.0.plist 3rd-Party support link
          [System] com.amazon.sendtokindle.launcher.plist 3rd-Party support link
          [System] com.flipvideo.FlipShare.AutoRun.plist 3rd-Party support link
          [System] com.google.keystone.agent.plist 3rd-Party support link
          [System] com.logmein.logmeingui.plist 3rd-Party support link
          [System] com.logmein.logmeinguiagent.plist 3rd-Party support link
          [System] com.logmein.logmeinguiagentatlogin.plist 3rd-Party support link
          [System] com.wacom.pentablet.plist 3rd-Party support link
User Launch Agents:
          [not loaded] com.adobe.ARM.[...].plist 3rd-Party support link
          [not loaded] com.adobe.ARM.[...].plist 3rd-Party support link
          [not loaded] com.macpaw.CleanMyMac.helperTool.plist 3rd-Party support link
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          [not loaded] com.macpaw.CleanMyMac2Helper.diskSpaceWatcher.plist 3rd-Party support link
          [not loaded] com.macpaw.CleanMyMac2Helper.scheduledScan.plist 3rd-Party support link
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          [not loaded] ws.agile.1PasswordAgent.plist 3rd-Party support link
User Login Items:
          iTunesHelper
          EvernoteHelper
          Skype
          Dropbox
          BitTorrent
          Google Drive
          AdobeResourceSynchronizer
          EvernoteHelper
          BambooCore
Internet Plug-ins:
          o1dbrowserplugin: Version: 5.2.4.18058 3rd-Party support link
          WacomNetscape: Version: 1.1.1-1 3rd-Party support link
          Default Browser: Version: 537 - SDK 10.9
          Flip4Mac WMV Plugin: Version: 2.4.4.2 3rd-Party support link
          WacomSafari: Version: 1.1.1-1 3rd-Party support link
          AdobeAAMDetect: Version: AdobeAAMDetect 1.0.0.0 - SDK 10.6 3rd-Party support link
          FlashPlayer-10.6: Version: 13.0.0.201 - SDK 10.6 3rd-Party support link
          AdobePDFViewerNPAPI: Version: 11.0.04 - SDK 10.6 3rd-Party support link
          LogMeIn: Version: 1.0.935 - SDK 10.7 3rd-Party support link
          Flash Player: Version: 13.0.0.201 - SDK 10.6 3rd-Party support link
          LogMeInSafari32: Version: 1.0.935 - SDK 10.7 3rd-Party support link
          googletalkbrowserplugin: Version: 5.2.4.18058 3rd-Party support link
          iPhotoPhotocast: Version: 7.0
          AdobePDFViewer: Version: 11.0.04 - SDK 10.6 3rd-Party support link
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          Silverlight: Version: 5.1.10411.0 - SDK 10.6 3rd-Party support link
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          Searchme: Version: 1.3
          1Password: Version: 3.9.20
Audio Plug-ins:
          BluetoothAudioPlugIn: Version: 1.0 - SDK 10.9
          AirPlay: Version: 2.0 - SDK 10.9
          AppleAVBAudio: Version: 203.2 - SDK 10.9
          iSightAudio: Version: 7.7.3 - SDK 10.9
iTunes Plug-ins:
          Quartz Composer Visualizer: Version: 1.4 - SDK 10.9
User Internet Plug-ins:
          WebEx64: Version: 1.0 - SDK 10.5 3rd-Party support link
          WebEx: Version: 1.0 3rd-Party support link
          CitrixOnlineWebDeploymentPlugin: Version: 1.0.94 3rd-Party support link
          Picasa: Version: 1.0 3rd-Party support link
          RealPlayer Plugin: Version: (null) 3rd-Party support link
3rd Party Preference Panes:
          3ivx MPEG-4 3rd-Party support link
          PenTablet 3rd-Party support link
          DC30 Xact Driver Panel 3rd-Party support link
          Flash Player 3rd-Party support link
          Flip4Mac WMV 3rd-Party support link
          Growl 3rd-Party support link
          Pastebot Sync 3rd-Party support link
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          TextExpander 3rd-Party support link
Old Applications:
          Transmit:          Version: 4.2 - SDK 10.5 3rd-Party support link
          Corel Painter Lite:          Version: 1.0.821 - SDK 10.5 3rd-Party support link
          SLLauncher:          Version: 1.0 - SDK 10.5 3rd-Party support link
                    /Library/Application Support/Microsoft/Silverlight/OutOfBrowser/SLLauncher.app
          /Users/[redacted]/Library/Application Support/WebEx Folder/1224
                    convertpdf:          Version: 1.2 - SDK 10.5 3rd-Party support link
                    Cisco WebEx Meeting Center:          Version: 1207.04.2732.10 - SDK 10.5 3rd-Party support link
                    asannotation2:          Version: 8.25.31.0 - SDK 10.5 3rd-Party support link
                    atmsupload:          Version: 4.14.29.0 - SDK 10.5 3rd-Party support link
Time Machine:
          Auto backup: YES
          Volumes being backed up:
                    Macintosh HD: Disk size: 464.96 GB Disk used: 77.79 GB
          Destinations:
                    Media [Local] (Last used)
                    Total size: 931.19 GB
                    Total number of backups: 173
                    Oldest backup: 2010-10-10 13:20:12 +0000
                    Last backup: 2014-04-22 16:27:56 +0000
                    Size of backup disk: Adequate
                              Backup size 931.19 GB > (Disk used 77.79 GB X 3)
          Time Machine details may not be accurate.
          All volumes being backed up may not be listed.
Top Processes by CPU:
               5%          WindowServer
               1%          EtreCheck
               1%          Google Chrome
               1%          Activity Monitor
               1%          launchservicesd
Top Processes by Memory:
          156 MB          com.apple.IconServicesAgent
          143 MB          mds_stores
          119 MB          WindowServer
          102 MB          Adobe Photoshop Elements
          102 MB          Skype
Virtual Memory Information:
          1.24 GB          Free RAM
          1.56 GB          Active RAM
          678 MB          Inactive RAM
          557 MB          Wired RAM
          579 MB          Page-ins
          0 B          Page-outs

IMac output to Plasma suddenly darker

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