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On the assumption that the problem is temporary - perhaps a variation or 'spike' on the power produced a lockup by chance - try turning Off the K-M printer.
And unplug it from the power.
And leave it that way long enough to rest and reset: at least for 20 minutes. Or longer.
After that time, try it again.
Let me know if the control panel comes to life again with this treatment.
If it does not, I will have more suggestions.