Recently bought a second hand Macbook Pro (previous model without SD card slot) and I noticed a faint reddish shape in the middle while I was playing Battlefield Bad Company 2. So I rebooted into Mac OS and filled the screen with a complete black picture and you can see what that revealed on the picture below.
This was visible both in Windows 7 and Mac os.
The machine was still under warranty so they changed the panel and poof no more red stain.
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