From: ohland@charter.net   
      
   I have seen an 8570 with missing slot covers, interior caked with dust   
   and grime, still chugging along...   
      
   If you open the PSU, look for dirt / dust / grease, you can use a Qtip   
   and alcohol, and / or compressed air to remove the grunge. Though odd,   
   the internal heatsinks and / or components may be coated. The "clicking"   
   might be thermal self-protect. Maybe.   
      
   Tomas Slavotinek wrote:   
   > 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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