I tested the old psu on another computer back then and it didn't work, so I doubt it was the connection. I have a feeling it's the same issue that caused my 820W to stop working
i agree, that is prob the situation. I don't know what the real problem is.
it could be a short on the mobo or something different.
I suggest you close this thread and try posting this again
with slightly different title & hope some of the
system experts see it and advise.