IPhone 4 - Will turn on plugged in USB/Wall, but not charging

Hi All
Please help!
I recently upgraded to an iPhone 4S and as such decided to sell my reliable iPhone 4.
However, after selling it, i got email from the buyer advising that it crashed afer 6 hours and then would not turn back on or charge.
I was forced to take the phone back and am not sure if he hs tampered with it, or changed parts etc.
I have attempted a restore, but it says Unknown Error 21.
I have 2 questions:
1. Can this be fixed? Any ideas would be great as i am stuck!
2. Is there a way to confirm the IMEI Number of the phone without it turning on?
Any help would be great!
Thanks all

Reset the phone by holding the HOME and SLEEP buttons until an Apple logo appears. If that doesn't resolve the problem you may have a bad battery.

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