Internal display color is wrong, outputs just fine. GPU or lcd trouble?

Hi there, I'm doing some troubleshooting for a clients son. He has a 2008 macbook air, A1237. It boots, but the internal display looks all wrong. The colors are low res and very washed out. However, when I have it connected to an external monitor the display appears fine. Even when holding down option on boot, the graphics are the same washed out quality. I have a couple pictures here. For some reason the kid completely removed OSX and has Win7 installed... I can't explain that. Anyway, I was wondering if anyone has come across this and if you're thinking it's a GPU issue or maybe just a broken display. I tried to determine if the kid had been rough with it and he insists he just turned it on one day and it was like this. No external damage from what I can see. I've attached a picture showing the two displays side-by-side.
If anyone can help me determine where the problem is I would be very grateful.

So, a quick update. I started by checking the display cable connection on the logic board. It appeared fine but I re-seated it anyway. But the display was the same. I then blew out the Win7 installation and re-installed Snow Leopard. Throughout the install and the subsequent boot up the internal display was the same as it had been; all the colors looked inverted, dark and lo-res. So I hooked up an external monitor to check out some statistics and when I first connected it, it showed up as an extended display. I chose to mirror the display and the internal display turned back to normal! All bright and Snow Leopard purple! I rebooted and the white screen showed up on start, where before it had been black. For one moment on reboot the white did invert to black, but only for a moment. It's currently back to the desktop, looking normal and I'm running updates. Any ideas here, at all?

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Internal display color is wrong, outputs just fine. GPU or lcd trouble?

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