Flashing screen when connected to computer

My ipod classic recently started acting up.
The screen is black and non-responsive.
When I connect it to the computer with the usb cable it flashes on and off with the apple logo screen.
The computer does not even recognize that anything is plugged in though, and therefore it does not show up under itunes so i cannot restore or reinstall it.
The only time the ipod works is when it is plugged into my Griffin iTrip.
It works fine in the car and says that the ipod is fully charged but the screen just goes blank as soon as i unplug it again.
I've tried resetting the ipod while it was plugged into the iTrip with no success.
is there anything i can do to save it?
Thanks in advance for any help.

Anyone have any suggestions on this problem? The exact same problem occurred to my wife's 80 GB classic yesterday. The grey apple screen flashes when hooked up to my iMac via a USB cable. iTunes does not recognize it. It works in the car or house though with our Griffin power accessories. Unplug it from the USB cord though and the screen goes black. Battery indicator says it is fully charged.
Any help would be appreciated!

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