Precision T5810 PSU problems

Hello,

I have a Precision T5810 that has a flashing orange led 2 - 2. It should be a problem with the power supply and by pressing the BIST button, the fan spins and stops. There should be the led under the rear transparent handle, but nothing turns on.

I'm looking for a replacement power supply but I'm having a hard time finding it. Mine is 685W with code 0K8CDY but I can't find it in Italy. Are there any modes compatible with my PC?