It's dead Jim, PC help required, others may also opine.

[tw]

Originally Posted by Beest

I tested the green grey and purple, with it just on , bit nothing much else happening. green was low - 0.02 V, purple and grey 5.02 V

Those numbers could not be better. Healthy. More informative would be red, yellow, and orange wires when fully loaded by multitasking. Do that when convenient - or to solve insomnia.