Integrated Graphics & External Screen Problem

Hey everyone,
Seems that my late 2008 15" MBP has decided to stop working with my external screen when running on the integrated graphics card. The external screen will flash up with my desktop but then switch to to telling me there is no signal being received.
I cannot confirm if it's because I used the OS X v10.6.3 v1.1 Update (Combo) but I'm quite sure it started after I updated to this.
Has anyone had any experience with this and found any solutions, or have a troubleshooting tips for me or am I looking at an archive and reinstall...

Found out that the under the resolution settings for my external screen, there were two options for the native resolutions at the same Hz. Although both identical settings, one worked while the other did not...

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<a href='http://bildr.no/view/366492'>

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When I turn on a video the screen on my MacBook Pro freezes. I've been through Apple Care and they couldn't fix the computer. I think the fan and the graphics are the problems

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