Electronics Repair Questions? Ask an Electronics Technician
Hello! Thank you for contacting JustAnswer.com; I am Russell H., an Expert here at JustAnswer.com, and I will do what I can to answer your question as well as it can be answered.
That must be very annoying. My first advice is: turn it Off. If it won't turn Off, unplug it from the power.
And leave it that way for at least 4 hours, or even overnight. When you tried to change the tax rate, it may have gotten a static discharge, enough to necessitate a long rest for the circuitry, to try to allow it to recover.
Let me know how it goes, by and by, please. Thanks.
You're welcome. Thank you for asking your question here at JustAnswer.com.