My iPaq had the "screen wander" problem. I put up with it for ages thinking that a repair would be a major hassle (plus I couldn't remember if it was still under warranty or not!).
Eventually rang Compaq - explained about not being sure on the warranty - "oh yes it is sir" they said. Man arrived to collect it that afternoon and it was back inside a couple of days - plus they'd changed the battery. Didn't cost me anything. First class service.
ps Wish I hadn't waited so long!

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