Where to look for info on Rooted S4 thats stuck on Sprint logo on start up

I have a S4 that was rooted and working fine. Had super User X Tools was all fine.When I attempted to change the Fonts today it all went to hell.When I was prompted to reboot phone rebooted to the Yellow sprint logo and just stays there. Went to system recovery and nothing. Phone wont connet to computers via usb to use odin.
Any ideas where to look next ?