Green/amber lights blink & Mac not recognizing unit

I used iTunes and loaded music onto my shuffle this morning with no problems. I listened to it for about an hour and a half. Later, I plugged it into my computer. The computer and iTunes no longer recognizes the unit. Our other computer does not recognize it either. When I connect it to the USB port, it:
1)blinks green once
2)pauses
3)blinks green/amber together
4)blinks amber thereafter
It still plays music... but of course I can't update the play list and do not know if it is actually charging.
Any and all suggestions are appreciated! I'm unable to do the restore since the computer doesn't know it's connected.

Cannot run the reset utility... the computer is not
recognizing that it is plugged in so I cannot select
the restore button...
What does Apple System Profiler say about the USB tree AND the "iPod"? Also, disconnect the Shuffle, reboot and try again.
BTW, the light sequence you listed is perfectly NORMAL...with the exception that something is accessing the Shuffle OR it's "enabled for data" e.g. it's being seen as a flash drive.

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Green/amber lights blink & Mac not recognizing unit

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