Samsung s4 stuck on logo
Hard Reset your phone.. But all your data and apps will be gone.. 

Turn off the phone. Press and hold at the same time Volume UP,Home and Power keys. When you see Galaxy logo release the Powerstrong text key but continue to hold the Volume Up key and the Home key.

Release them when the Android System Recovery screen appears. Use Volume Up/Down keys for navigation and Power On key for OK. Choose "wipe cache partition", "Yes -- delete all user data", "reboot system now".

And click on Wipe Data/Factory Reset 

You are done then.