PD-600C PDA Won't turn on?
 

I just purchased it used from a guy who demostrated it to me and it worked perfectly fine. But I got home and tried to turn it on, it simply won't turn on. I tried to charge the battery for 5 hours according to the manual. I tried to do a soft reset, the hard reset, taking both main and back up batteries out for 10 minutes and still won't turn on.

Any idea what the issue might be?