If your competent Gary check and see if you are getting mains to the power supply. If that’s all OK it sounds like the power supply is dead or possibly just one output maybe just the 5Volts.
If you find this to be the case give me a nudge as I have a decent co who most likely can repair the supply at very good prices with great service.
On the back of the switch check to see if the wire is connected to the switch. It should just be a slide in connection. If it looks ok still disconnect it and then reconnect. The vibration of the machine can cause these to come undone or to result in a poor connection.
Worth a try. 😉
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