Exclamation Panasonic Phone Hangs At Startup

Hi everyone,
I was surfing through my phone yest. when it was lagging alot, so i decided to restart it.
When i restarted it, it was hanging on panasonic logo, it wasnt going further. I tried to hard factory reset and everything but didnt happen.
I even tried connecting to the comp but didnt connect!!!!
Please help!!!!!