Welcome to SPCR,
Look into SPCR Seasonic Platinum Fanless 520W PSU
, specially look into the adendum and try out what is suggested there.
If it doesnt work, and you want to go with another PSU, check the following,KingWin Lazer Platinum Series 550 Watt Power Supply with Universal Modular Cables LZP-550 $129.99
, reviewed by SPCR Kingwin Lazer Platinum 550W Power Supply
and got editors choice, really a nice PSU for the money, manufactuered by Superflower, and imo one that rivals seasonic platinum series.
If you were to be fine with a totally pasive PSU, consider KingWin Stryker 500
and/or Rosewill SilentNight-500
, both were reviewed by SPCR, Kingwin Stryker
and Rosewill Silent Night 500 Platinum 80 Plus
, and got editors choice.
If you want to save some $$$, i would also suggest Corsair RM series, its also semi passive, totally modular, and gold certified, and atm going for $80, Corsair RM Series 550 Watt ATX/EPS 80PLUS Gold-Certified Power Supply - CP-9020053-NA RM550