Rooted Xperia M wont enter OS

[Leonbidis]

So yesterday i gave my phone to a guy to root it. HE gave it back and it was all fine and stuff (although i still couldnt send apps to sd card). Today while i was playing pokemon on gba suddenly my phone shutdown and now it keeps rebooting without even entering the OS. Is there anything i can do? i still have warranty but since the phone is rooted the waranty got void 🙁

 

[Phillip Corcoran]

Hand your phone back to be looked at by the guy who rooted it. Rooting phone while it's still under warranty - - very bad idea!