How to fix a crash of the teacher station control panel

  1. Problem: control panel on the teacher station  unresponsive (both hardware and software buttons). No AV and on/off switching.
  2. Cause: Octo switch in the AV cabinet crashed (it needs replacing).
  3. Resolution: Open the door to the AV cabinet and powercycle the switch (= unplug and replug the lower thin black cable in the 1st or top rightmost thin black cable in the 2nd photo). Or use the call button (still functional) and wait for help.
  4. image 
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