My T500 external display colour issue

Hello all,
Before I invoke my warranty on my laptop I thought I would try here first.  My external display all of a sudden today, started to turn yellow.  It seems like its random as to what exactly is being turned yellow, but it seems like almost every part of the screen is effected.  Some facts:
1.  I have tried 2 different monitors and 3 different VGA cables with the exact same results.
2.  When I first plugged the monitor in today and set it to output only to monitor, the screen was fine, when I changed it to 1680x1050, the yellow instantly showed up
3.  Whatever resolution I try now, its always the same
4.  I have rebooted, tried extended, clone and one screen displays, I have even tried rotating the display!
So thats the story, my gut feeling says the video card in the laptop is the issue, but I do not know enough about it to be sure.
Anything anybody can think of that I can try before calling it in?
Cheers,
Darren

Does it work if you plug it into a different source? What if you plug the cable directly into the T500's onboard DisplayPort?
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X61T: L7500, 3GB RAM, 500GB HDD, XGA screen, Ultrabase
Y3P: 5Y70, 8GB RAM, 256GB SSD, QHD+ screen

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    13/10/12 8:39:31.000 AM kernel[0]: IO80211Controller::dataLinkLayerAttachComplete():  adding AppleEFINVRAM notification
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    13/10/12 8:39:32.000 AM kernel[0]: IOBluetoothUSBDFU::probe
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    13/10/12 8:39:32.000 AM kernel[0]: AGC: 3.2.11, HW version=3.2.19 [3.2.8], flags:0, features:20600
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    13/10/12 8:39:33.624 AM WindowServer[567]: Session 256 released (1 references)
    13/10/12 8:39:33.635 AM WindowServer[567]: Session 256 retained (2 references)
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    off-line, enabled, Vendor ffffffff, Model ffffffff, S/N ffffffff, Unit 3, Rotation 0
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    off-line, enabled, Vendor ffffffff, Model ffffffff, S/N ffffffff, Unit 2, Rotation 0
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    off-line, enabled, Vendor ffffffff, Model ffffffff, S/N ffffffff, Unit 1, Rotation 0
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    off-line, enabled, Vendor ffffffff, Model ffffffff, S/N ffffffff, Unit 2, Rotation 0
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    off-line, enabled, Vendor ffffffff, Model ffffffff, S/N ffffffff, Unit 1, Rotation 0
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    13/10/12 8:39:35.124 AM com.apple.SecurityServer[15]: Session 100005 created
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    13/10/12 8:39:35.146 AM hidd[540]: CGSDisplayServerShutdown: Detaching display subsystem from window server
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