Prospero X3 hardware problem: power supply indicates "alarm" and "fault"

[Helfred]

Hi community,
 
after working around 3 weeks in 24/7 mode, my X3 shows since sunday on the rear side the "Alarm" led and the "Fault" led.
 
I had this case already once, but that time i switched off all cables and plugged in after a while and the server ran.
 
Now I plug in the power cord after a few minutes and the lights are going on again.
 
What can i do ?
 
Every hint very appreciated!