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Mark IV fail to boot - Flashing standby light

2015-12-23 by Sion Roberts

My Mark IV is failing to boot up.  The Standby/ON LED just flashes off and on no matter how long I wait.
Looking underneath, the power supply has four LEDs.  Number 2 is permanently lit up, Number 1 flashes on briefly then off for a longer period. LEDs 3 and 4 aren't lit up.  Not sure what is normal with these LEDs.
I can hear some ticking and scratchy noises from the DIO-100 and the DMC-100 during power on but then goes quiet after a short while.
Can anyone offer any advice?
Sion

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