mr816x power supply problems

HI , i have noticed a hum /noise being inducted from my power supply, if i keep any where near my equipment the hum comes back ,but even at furthest i can get the block i can still hear the hum just. i have checked all other cables for earth loops .but it seams i have a faulty power supply unit .so can these be replaced or bought from somewhere.

Just for the record, a replacement PSU has been sent…