The Zune doesn't need to be connected to check the firmware and bootloader.
On your device go to Settings > About > Zune
What version (build) is shown?
Also the bootloader?
If it is not Version 2.3 (1145)
Bootloader 435
then you may want to do an update.
the compter does not show that it is connected.
When you say it doesnt show, in Windows Explorer? or in Zune (software)?
Yes hard reset is back and left.