Public bug reported:

   Once I stat up my computer and login, after a time the system
opterating is not reponse. The mouse and keyboard can't use. the monitor
display no content but gray picture. I don't know what cause this
situation.  Maybe the driver of  graphics card  is not suitable. please
help me solve the problem ,thanks

** Affects: ubuntu-docs (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1588206

Title:
  ubuntu 14.04 in Dell optiplex 9020 no response

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