From: slavotinek@gmail.com   
      
   On 09.01.2023 23:48, Pertti Helander wrote:   
   > I didn´t knew that pins 1-2 must be shorted before measuring other pin   
   voltages. I short pins 1-2 and PSU fan starts. I start to measure voltages and   
   between pins 5-3 it was 5 V but between 5-4 heard some klick and power went   
   down. I guess fuse was    
   burnt, I must open PSU and find where fuses locate and renew burnt fuse. Must   
   check size, current A and find a shop that sells these in Finland,   
      
   The click you heard might have been a relay. Did the PSU make a similar   
   sound when you powered it on?   
      
   This may be the same problem you were having before when the machine   
   shut down randomly. Disconnect the PSU, give it a minute and try   
   restarting it using the same method as before. If it powers on, just   
   leave it running, not touching anything and see if it shuts down on its   
   own again.   
      
   Even a dead short on one of the voltage rails (touching DMM probes or   
   whatever) should not cause the the internal fuse to blow. An   
   over-current protection (OCP) should kick in and shut down the unit.   
      
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