The internal parts could just be stuck. Take the drive out of your computer entirely, and do the inertial spin. The "inertial spin" means to force the platters inside to spin with respect to the body of the drive. Hold the drive like a card-shark would a deck of cards, and whip it back and forth as quickly as you can manage (people with weak wrists will find this annoying, even painful), rotating at your wrist. After a dozen or so shakes, the platters inside should go through at least 1 revolution.
Put it back into your computer and see if it behaves again. If so, then great ... backup your data immediately and then never trust that drive again for any reason. It might be a good time to try out some drive mirroring (NT had that, so I suppose XP has it too), which would introduce fault tolerance that would allow the drive to be useful if not trusted.
If the inertial spin doesn't fix it, then confirm your jumper settings. Perhaps a jumper fell off when you rummaged in you computer case.
If the settings are OK, then it's time to jump on another computer and surf Maxtor's site for diag software.