IPad no longer recognized by any computer after 4.2.1 update

Hi,
my iPad is no longer recognized by any computer after the 4.2.1 update. It does not show up in iTunes and this even in recovery mode. When connected to charger it does not show that it would charge (but it does). The iPad is still usable except in the iPod app is says "cancelling sync" and does not show any music.
I already reinstalled iTunes, reinstalled the Apple Mobile Device Service, used different computers with different OS version, but it does not show up, not even in the system profiler (USB tab).
Any idea what I should do? I mean it is quite unlikely that there is a hardware issue as the problems appeared right after the 4.2.1 update (from 4.2).
Thanks in advance

Yes I know, I already reset like 100 times. Turned off-on...
I guess a recovery could solve the problem, but how do it if the iPad does not even appear in iTunes. I guess it is somewhat stuck in "cancelling sync" and therefore will not accept an USB connection (the USB port behaves like it is deactivated).

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