Phone boots into ODIN mode - Help please (not trying to root)

My phone went into ODIN mode and I took the battery out and put it back in and it works fine. Yea!!
 
TRy THis
... if you have Nova laucher ....go to settings and change default home to touch wiz home and you can now go to ultra power mode and you can turn it off. Definitely a flaw for nova launcher
 
I believe for that generation of device if nothing else works, you could try to use the recovery function in Samsung Kies. **Note, if you do that it Will Wipe any data on the phone** but you should have a working phone again. Assuming nothing is wrong with it.

Cheers,
BR