Upgraded board and ...
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Upgraded board and touch screen, now printer doesn’t work

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Joined: 2 months ago
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On my 3 Pro, I inadvertently shorted pins in the original knob screen, big flash and nothing thereafter.

Power supply tested good with proper voltages and quality.

I replaced the motherboard with 4.2.7 and the compatible touch screen. Then downloaded the firmware to the SD card, on both 8 bit and 32 bit micros.

At power up, the screen shows the Creality logo but won’t go further, leaving a live screen but will accept no input commands.

I have verified my board wire connections are correct.

Connecting my computer to the USB port does light the screen.

At this point I don’t know how to troubleshoot further.  Has anyone else had this problem? How was it resolved?