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#41
Will the drive boot any other bootable CD's?
Is the XP CD one which you burned yourself, and is it known to boot in the past? If so, you can try burning another using ImgBurn at 4x speed with Verify.
Is the XP CD visibly dirty? If so, wash it with a soft cloth. You can also try copying it using ImgBurn to Copy Disk Image>Write Disk image.