Thanks, but no. That's part of the strange behavior. I can upload new firmware, but the printer is supposed to reboot itself once the update is complete. It doesn't do that step (and has assorted other odd issues). The firmware upload and install process seems to go through without error, per feedback from the updating program, but the printer itself doesn't seem to move to the next step from there. That's why I'm thinking the parameters in the NVRAM are corrupted, causing it to essentially lock up.
It's currently showing Error Code 1410, which indicates a motherboard replacement is needed, but I'm virtually certain all the hardware is fine. It was working very well before I did something in an adjustment program that is causing the current issues. Unfortunately, I was just poking around in the program to get familiar with it, and can't recall exactly what I did that triggered the current state.
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