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Aha — the reason why this option was greyed out is, I think, because I was still logged in under the everyday account. When I logged out of the everyday account, and logged into my admin account (instead of just switching straight to the admin account, leaving my everyday account logged in), then the “Allow user to administer this computer” checkbox for my ...


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You can not delete the Guest User. What you are seeing is the correct behaviour for OS X; the minus button (-) is automatically disabled when the Guest User account is selected. You appear to have disabled the Guest User account by unchecking all the options. This is enough to stop anyone logging in as guest on your Mac.


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The simplest fix is to either connect the Mac to another Mac with yours in Target Disk Mode to save the files you need or to make a new admin account. How to set single / target disk: Stuck at Apple logo during boot. Cannot enter Safe mode. Cannot use Recovery USB How to make a new admin account by deleting the /var/db/.AppleSetupDone file while booted ...


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According to several sources: Apple discussions or Mac notebooks: Apple Hardware Test may report "HDD" alert the error: error 4HDD/11/40000000:SATA(0,0) may be erroneous or at least unclear/dubious. It may be related to the vanishing of your users in the Login Screen or not. Depending on your findings in Single User Mode you have several options: ...


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Try this command dscl . list /Users | grep -v '^_' to show all users. Then see if there are users with your desired username already. If there are, you can delete them. Go to System Preference -> Users&Groups and delete all that you do not need.


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You can create a low-numbered user via dscl, as per this Apple support page and it will be hidden from most views. Also, I believe that if you set the user home directory to something like /var/empty then ssh will log in but the gui will not.


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Set up your new User as a Sharing Only account, this gives them no actual account on the computer itself that they can log into… System Prefs > Users & Groups Click the lock Click the + sign to add a new User Set the new account to sharing only from the drop menu [stepped out on the pic for clarity] Ref : Apple KB - OS X Yosemite: Create a ...


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_avqmd is an account created by the Avira anti-virus. This account is used to run background tasks without the use of the overall priviliged account root. This is a correct security practice: separation of priviledge. If you want to see what this account is used for, run for example: ps -l -u _avqmd If you didn't install Avira, then this account is a ...


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You might be able to get some more details on the user by querying your directory database rather than looking at the record files on the filesystem: dscl . -read /Users/_avqmd Hopefully you'll find enough threads to pull on. It's not an account on any of the first few Macs I checked, but perhaps someone else has tracked it down already and has a more ...



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