That's exactly what I was thinking! Moving the connector may switch it between 110/220V.

Maybe waynestewart , you could have a look at the position of that plug (I assume you are on 110V).

Otherwise I might have to use an old PC psu.

PS: no labels anywhere, not even on the botton, but I haven't taken out the pcb to have a look there yet...these Macs really are a full time job....