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RE: Optiplex 9010 AIO Screen goes black and freezes on logout.

SAME issues with many of the 9020 here as well same set up 25 of them. I did the same thing you tried as well. After a reboot the system seems to work fine, no more buzzing sound and the pause while typing for a few days. Then it will start to pausing and buz..One of my staff found the pause and the Buz sound happen at the same time. I thought it may had been a bad power strip [lack of grounding]...It must be power supply or Motherboard. This does not happen to all 9020 just some but over half of them. I'm now leaning towards Hardware.

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