Mark Nord, I did not modify any fonts. I merely tried to change the font by selecting a different one from the menu. A message came up saying the font change required a restart and that's when I got the reboot loop.
However I have now tried your suggestion of deleting that prsp.sh file and everything seems to be back to normal.
Ripplinger, I had already tried what worked for you but it was not successful for me.
Thanks so much to both of you for your responses.