Is there any chance that the PSU is in good condition because things like this happen sometime when PSU need to be replace, if not it could be because the M3 watt was 1785.
How is that a problem? it's only common sense that every miner comes with a PSU that can deliver more power than the miner needs.
Try this process, disconnect everything, check if the power switch located at the bottom of the division if not accidentally turn off
There is no "power switch" in these PSUs.
I will advise you to read this
article for more help.
This is regular PC PSU, has nothing to do with M3's PSU.
OP, what is the voltage on the socket? how many of them do you have? do they all have the same issue? does any light come on? fans spin? please provide all this information in detail so we can help you.