I've just ordered a new 2012 replacement PSU (genuine Sony) which is identified by a slimmer size, and is rated at 19.5V compared to the original. Most importantly, it eliminates the ground hum loops interference that you can get on USB allegedly.
JRiver MC17 -> Cambridge Audio DACmagic+ -> Roksan Caspian M2 -> ProAc D18
Bum steer from another forum specialising in computer audio...
What you need is one of these:
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