My mp3/4 3rd gen nano wont turn on

its impossile. you can only upload songs and games onto the ipod. sorry.

Try put the cord in a diffrent port or slot besides the one you normally use. Some times they short out. Mines did. Or you could use someone else computer.

How old is it? if it's under warranty apple may fix it.
Simply, if you charge your iPod through you computer then the battery could be damaged. USB ports only put out 5 volts. If you have an AC charger that puts out 9.5 volts then consider charging it with that. Some AC adapters only put out 5 volts for the purpose matching the USB standard, but it's not good for the ipod.

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hope this helps

Unfortunately, unplugging it during a restore or transfer is the one sure way to kill an Mp3 player. Before I became an expert, I too killed my first Mp3 player by unplugging during a firmware upgrade. Call Apple and see if you are under warranty, because that is definitely covered.

In theory you could reload the firmware on the device, but it just won't work, because you can't force the PC to recognize it at this point.

Last ditch effort - reset three times, and then plug it into computer while holding in the right part of the wheel. No promises.

Turn repeat off in the menu.
Setting iPod nano to Repeat Songs
You can set iPod nano to repeat a song over and over, or to repeat a sequence of
songs. iPod nano repeats songs within the list you choose to play.
To set iPod nano to repeat songs:
m Choose Settings from the iPod nano main menu.
â To repeat all songs in the list, set Repeat to All.
â To repeat one song over and over, set Repeat to One.
To turn repat off, go to Repeat off.

have you tryed the 5 solutions?
http://www.fixya.com/support/r561901-ipod_problems_start_5_solutions

does the ipod power up when you connect it to the charger and does it turn off and wont turn on when you unplug it?

i try to upload photos from my nikon coolpix p50 to 'my pictures' by using my usb cord. it always used to work but not now. something pops up that says "please make sure the device is turned on and properly connected to the computer." i used the the same usb cord as before when it worked.

my computer dosent recognase my ipod...what should i do?

you need to download itunes from the apple website

Try these options i got them from apple when my ipod dident work trying a new port and reinstalling itunes worked for me 1)Reset your iPod. 2)Retry with a different USB or FireWire port. 3)Restart your computer and make sure you have the latest software updates installed. 4)Remove iTunes software and then reinstall iTunes software from latest versions on the web. last resort 5)Restore your iPod. See ?Updating and Restoring iPod Software? in the user's guide.