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QMX+ failure. Power disconnected when in terminal mode #problem #QMXplus #troubleshooting

 

My recently built QMX+ has just stopped working.

I was running the diagnostics from the terminal and disconnected power from the barrel connector whilst still connected to the terminal via USB.

The QMX will no longer power up.? The screen does not illuminate.? It does not appear as a COM port or a USB memory device.? A click can be heard in the earphones when the 'pwr' button is pressed or released.? There is a slight dip on the 12v power when measured at the barrel connector but the QMX+ fails to power up. There is no evidence of damaged component.

Please can you suggest where I start fault finding?
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