iPod not syncing to iTunes. New battery. Swapped HDD with compact SD.

iPod not syncing to iTunes. New battery. Swapped HDD with compact SD.
I have a 3rd gen classic iPod. Replaced the battery and swapped out the original hard drive with a compact flash memory card. When I plug it in to my computer iTunes does not recognize it. The screen shows the Apple then the drive with the “!" Does this mean the cable and/or the logic board are bad?

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