I do have a comment on this. CompUSA is going out of business and had a 3rd party combination wall/car charger with a retractable cable. I bought one and my brother bought one. The first day my brother used it to charge his Zune 4 and the ZunePad stopped working. We got it replaced. A few weeks later my wife charged her Zune with the cable and the same thing happened on her 80. We were able to drain the battery and then recharge it and it started working again but since then I have only used the retractable USB cable as I don't want it to happen again. I don't know if that was the cause or just a coincidence.

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