QUOTE(iAlien @ Apr 1 2013, 10:26 AM)
previously stuck there also
nwm, later i go service center, let see what they say
Btw, any idaes to back up data if i didn't root it?? cuz i am almost crazy since 2 times ad

Bro.. I haven't come across an apps that backing up apps data without rooting cause apps data store in root area. Now you still stuck at boot screen or you already able to access your phone?
Before happening, you installed any apps causing it or just happened like that?
If you can access to your phone, if not too hassle use kies to back (many will against my suggestion) or download apps like super backup, mybackup, appsmonster and etc..
Maybe you want to try to factory reset and wipe from recovery mode yourself...