My iPhone 4 Safari is not working?

I had Jailbreak my iPhone 4 and its not successful. When I tap to safari the screen was blank even my calendar I tap its goes blank too. And I can't watch video in YouTube, everything I try to restore my iPhone and do reset and its not working. I try to reboot my iPhone in rednow and my iPhone apple logo appear and I'm not sure it's installing or freeze cus takes like 1hr or 2 hrs i been waiting cause I saw the apple logo is like freeze. I try to install IOS 7 at settings Under software hardware. But still the same >,< can please Help! Me this make me feel me so regard doing jailbreak. I wan my old iPhone memory back.

Try to restore a backup from itunes.