at the risk of suggesting the easiest first try ... have you hit the Esc key? Otherwise, again, at the risk of over-simplifying your situation, have you restarted the machine? My apologies in advance if you're like, "duh, I did all that."
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You might have a script running in a loop. When a script runs, you see this cursor change which is telling you that you can press command and period to force the script to halt.
The was the problem, i.e., script was stuck in a loop.