Howdy there,
I am having trouble with a second hand 160GB iPod classic I have bought recently (very good condition, not showing any damages, light usual scratches on the back, mint screen due to use of case). For the first few days it worked perfectly, after having synchronized my 8900+ songs via iTunes 12.0.1.26. However, things got bad since few days. I couldn't get the iPod to start as usual, by touching Play, Menu, or any other button; it could only be switched on by a Hard Reset (Menu+Select), but otherwise worked fine, including when plugged in iTunes.
Then things got more complicated:
1. The iPod would not start at all, even with Hard Reset. When I plugged into iTunes, it said that it could not recognize the iPod. Eventually I had to do a Recovery via iTunes, then synchronize again the 8900+ songs.
2. The next day however, it was impossible again to have it start again. I had apparently entered a Recovery Loop: after a first Recovery, iTunes asked me to do another one, etc. I somehow managed to exit the loop, but had the same issue again (i.e. not starting even with Hard Reset), although I had started to fraction synchronization (i.e. going 300 songs by 300 songs). Scan via Disk Utility indicated no error, nothing to repair. I had changed the name.
3. Eventually, yesterday, I have chosen to reformat the iPod via Disk Utility, with a zero-out single pass which has taken 9 hours. This morning, I performed a scan via Disk Utility, all fine. I have changed the name again. Then I started to fraction-synchronize the iPod up until 1500+ songs. However, when I returned a few hours later, the iPod would not start again, only in Hard Reset. Then it is recognized by iTunes, and I can still transfer songs.
4. So I have decided to run a S.M.A.R.T. diagnosis, and the numbers I go by seem perfectly normal given what I have read here:
Retracts: 174
Reallocs: 1
Pending sectors: 0
PowerOn Hours: 142
Start/Stops: 52
Temp: Current 23c
Temp: Min 11c
Temp: Max 52c
So I am beginning to be a bit lost… Even if the iPod starts only in Hard Reset mode (i.e. it will not switch on when pressing any keys such as Play, Menu, Hold on/off, etc.), it is not a convenient process, and I am not sure the HD will always like so many reboots. What is even weirder is that if I eject the iPod now, it will perfectly play songs, and also be switched off and on (as usual). But a few hours later, it is likely to only be switched on again through a Hard Reset.
Any ideas, suggestions, etc. ? Thanks a lot
TL; DR: 160GB iPod Classic can only be switched on via Hard Reset (Menu+Select) although SMART data seems OK and works fine with iTunes once rebooted, already tried name change twice + zero-out format via Disk Utility.
160GB iPod Classic / Mac OS X Yosemite 10.10 / iTunes 12.0.1.26.