It is the 600. When the battery is dead, the computer can not recognize the connection. The PRS600 seems to have charging issues. I am still working them out. I have not solved the problem yet. Resetting does not always work, since you use battery life while resetting it! The a/c adapter will give you power while it is plugged in, but the 600 just recognizes that as being a full battery!...so it won't take a charge...Ugh! I guess, if you can avoid it, don't let the battery go all the way dead!
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