REBOOT AGAIN & AGAIN(DOESN'T LOAD OS)?

[shanuka]

My phone restar again & again when I swich on.I have installed a font pack.after that this problem is occured.plz tell me way to resolve this problem without repairing os(if it is possible)

[CapecekCZ]

Do you have rooted device? If you changed some system files... That could be the problem. If it's SW problem you will have to flash ICS or GB. if reflashing official FW won't help then it's HW problem...