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I would advise you to pull the power cord on your register.
Leave it that way for at least 1/2 hour, to cool off and 'rest-reset'.
Then plug it in after that time, and see if it is now responsive.
Try this reset first - it will not erase any memory or programming:
Unplug the register from the power.
Turn the key to PGM.
Hold down the Journal Feed and Receipt Feed keys, and plug the register back in.
Turn the key back to REG.
Does that help?
If not, would you be willing to risk erasing all the memory and programming in the register, by doing a Master Reset?