Intermittent power issue

Hello.
I've had my current Overclockers machine for about three years, never had an issue.
A week ago Sunday, I went to switch on the machine, nothing, no fans, lights or noise. It was as if the machine had been unplugged. I thought of the cheapest option first and ordered some new fuses. With a new fuse in the plug I tested the machine in a different socket. It sprang back to life and was fine all week until yesterday when the same thing happened. No power.
Today I've taken the machine...

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