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Black screen on Mac

Hello,

 

My Mac (see hardware specification Below ) is running under Sierra 10.12.6.

 

Since a few days I can work only max an hour before the screen gets black and let me no other option than reboot. Even the mouse is not visible.

My first impression is a problem with the cooling (fans) as the computer seems to be working longer after a long shutdown period. But I cannot be sure.

I use a pgm controlling the fans and make them run at more than 2000 rpm but it does not change anything. Sometimes I get the black screen after only a few minutes.

I used the MacOS utilities to completely reinstall a new Sierra OS. It did not solve the problem.

 

I tried to start in Diagnostic mode ( Startup holding the 'D' key with an ethernet cable connection) but I get a message " apple.com/support -3403D" and cannot complete a diagnostic.

 

Can somebody help me on this issue ?

 

Thank you

Eric

 

 

Hardware Overview:

 

  Model Name: iMac

  Model Identifier: iMac11,3

  Processor Name: Intel Core i3

  Processor Speed: 3,2 GHz

  Number of Processors: 1

  Total Number of Cores: 2

  L2 Cache (per Core): 256 KB

  L3 Cache: 4 MB

  Memory: 12 GB

  Processor Interconnect Speed: 5,86 GT/s

  Boot ROM Version: IM112.0057.B09

  SMC Version (system): 1.59f2

  Serial Number (system): W80287QADB6

  Hardware UUID: 74A46DDD-CED5-564A-A689-27ED48733121

最后更新：2017-10-02 22:23:09

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