APM only arms with USB connected

I recently had a hardware issue with my APM2.6 and discovered the power Zener had blown so I replaced it.

Now when I arm the APM with just the flight battery, the motors spin up then stop and it disarms.

If I try with the USB connected, then it works OK but obviously I cannot fly with the laptop hanging underneath :-)

Any suggestions of where to look?  I would guess at it being a PSU issue...

Thanks in anticipation,

Jim an Kent.

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