Connections b> The USB cable must be securely connected both to the iPod and to the selected USB port on the computer. Reattach the cable at both ends, and click "Computer" in the start menu to see if the iPod is shown connected to the drive for that USB port. b>
Drivers b> If the drivers of the computer responsible for the USB interface are out of date, malfunctioning or incorrectly installed, that may also cause the iPod to not be recognized by the computer. If this is the case, the device may not appear in iTunes and there may be an exclamation point next to the device in Device Manager. b>
Software b> The latest version of iTunes is recommended to best communicate with the various models of iPod. Go to the iTunes website or click "Help" and "Check for Updates" in iTunes to install the most recent update. Further, the computer must be running Windows XP, Vista or Windows 7 for PCs, or OS X v.10.4.11 or later for Macs. b>
Battery b> The iPod's battery must have sufficient charge to be recognized in iTunes; charge it either via USB connection or another power source if the indicator shows a low battery. Once the battery has charged, try to connect the iPod to the computer via USB cable again.
http://support.apple.com/kb/TS1538 Ipod not recognized
http://support.apple.com/kb/TS1495 Device not recognized
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