I would say so, is this a normal ATX powersupply? if so unhook everything and put a jumper in the atx plug from the green to any black, should turn on supply if it keeps running you might have another issue, it is cuts off then you know it is power supply, make sure the power supply fan runs , sometimes if the fan quits for it they will shut off as well.
Hi,
The problem is fixed. Replace the power supply and it is running again. One fan on the power supply had failed and that shut down the 12V rail.
Now my problem is to find the firmware for the A2 Mini, Plenty of options for the A2 but the A2 Mini has a slightly different setup.
Regards