50g

When I turn on the 50g, it says "HP 49 CAS by Parisse, Heiskanen & 
Fiechter"  and won't let me do anything.  If I reset it on the back, I 
get the same message.  If I do a 3-key clear memory without restore, I 
get the same message.  If I empty all the batteries and plug into the 
USB I get the same message.  Is this calculator toast?

Randy