Username 'disappeared' from System Preferences List

System is a MAC Mini with 8GB of memory and 250GB SSD with a 4TB Pegasus R4 subsystem. It is running Mavericks 10.9.4 and Server 3.1.2. A month or so ago one of its non-admin users disappeared from the System Preferences User list and from the server app's Users list. The user is unable to connect to the server. When I tried to recreate the user I was told that the shortname is already in use. Changing the name of the folder in /Users doesn't change anything.
I need to either regain access to the username or delete the username so I can create it again.
Can anyone help me?

The following command will output a list of local users. Is the one in question included?
dscl . -list /Users

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Bluetooth disappeared from system preferences and menu bar...

My bluetooth preferences disappearead from system preferences as well as the menu bar. I discovered this because my bluetooth mighty mouse stopped working. I tried replacing the batteries but nothing happened. I used my trackpad to click on the bluetooth icon on my menu bar and told it to connect to my mouse, which was there in the list. I got the swirling ball and so restarted my computer, when it came back, bluetooth was gone from the menu bar and system preferences, so now I don't know how to reconnect my mouse.
I tried resetting the PRAM and NVRAM as recommended by another post, I tried it twice as the instructions outline, but I haven't had any success.
I have tried doing spotlight for bluetooth in system preferences, this takes me to keyboard and mouse, then I get this message:
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When I do a spotlight on the entire system, I get a result for bluetooth in system preferences, when I click on that, I get this message:
"You cannot open “Bluetooth” preferences pane because it is not available to you at this time. You might need to connect a device to your computer to see this preferences pane."
But, the irony is, that I can't connect a bluetooth device without this option in preferences. Also, in utilities, I remember that there used to be a bluetooth setup assistant, and that is not longer there.
I realize other threads have come up on this, but I haven't found anything besides deleting the plist, restarting, and resetting the PRAM and NVRAM (whatever that is). I've tried this but haven't been successful so I'm looking for more ideas.
Dan

HI Daniel,
Try deleting this file.
com.apple.preferencepanes.cache
~/Library/Caches.
Move that file to the Trash and restart your Mac.
If that doesn't help, download and install the 10.5.8 combo update available here.
http://support.apple.com/downloads/MacOS_X_10_5_8_ComboUpdate
It's ok to do this even though you are already running 10.5.8.
Make sure and repair disk permissions after the installation.
Quit any open applications/programs. Launch Disk Utility. (Applications/Utilities) Select MacintoshHD in the panel on the left, select the FirstAid tab. Click: Repair Disk Permissions. When it's finished from the Menu Bar, Quit Disk Utility and restart your Mac. If you see a long list of "messages" in the permissions window, it's ok. That can be ignored. As long as you see, "Permissions Repair Complete" when it's finished... you're done. Quit Disk Utility and restart your Mac.
Carolyn
Message was edited by: Carolyn Samit

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In many cases, this issue is caused by a hardware fault. A short circuit or a microscopic break in a solder joint may open and close depending on temperature, making the failure intermittent.
Test after taking each of the following steps that you haven't already taken. Back up all data before making any changes.
1. If you can connect to the Internet via Ethernet, Bluetooth, or a USB network device, make sure all available OS X updates are installed. If Wi-Fi is your only means of network access, skip this step.
2. Reset the NVRAM.
3. Reset the System Management Controller.
4. Start up in Recovery mode. In the menu bar of the OS X Utilities screen, there's a Wi-Fi menu. If it works, selectInstall OS X. If your Mac was upgraded from an older version of OS X, you’ll need the Apple ID and password you used to upgrade, so make a note of those before you begin.
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Bluetooth disappeared from System Preferences

When I fired up my PowerBook G4 this morning my Bluetooth is no longer available. When I go to System Preferences the Bluetooth preference is not there. I've rebooted to no avail.
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When posting a log extract, be selective. In most cases, a few dozen lines are more than enough.
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Important: Some private information, such as your name, may appear in the log. Anonymize before posting.
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Hi,
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Bluetooth vanished from system preferences

Today my system seems to have forgotten that it has bluetooth hardware. The OS doesn't see it. In fact, the bluetooth panel has vanished from system preferences.
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reset the PRAM
reset the SMC
tried to delete com.apple.bluetooth.??? (but it wasn't there)
deleted com.apple.preferencepane.cache
No luck - stil no BT.
What should I try next?
system: 2010 mbp 15" i7 2.66 with hi-res anti-glare, running 10.8.2
Thanks a lot for your wisdom...
Steve

Has the black barrel by the hinge of the LCD been damaged or exposed to liquid recently?
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I cloud missing from System preferences.

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Is iCloud the only thing missing from System Preferences?
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HT5527 Hello, I had 25Go transfered from MobileMe, skimmed down to 5Go now. I cleaned my emails. From mail, on my mac, 'get account information' shows less than 1 Go... From System preferences/iCloud, up to yesterday it showed 12Go... I don't understand!

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These information are contradctory. Now my account is locked.
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I cant't verify my icloud account, never received verification email, i did requested it from system preference menu

i cant't verify my icloud account, never received verification email, i did requested it from system preference menu

Welcome to the Apple Community.
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HT4901 iCloud app can't be launched from system preferences.

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Process:         System Preferences [408]
Path:            /Applications/System Preferences.app/Contents/MacOS/System Preferences
Identifier:      com.apple.systempreferences
Version:         11.0 (11.0)
Build Info:      SystemPrefsApp-214009000000000~8
Code Type:       X86-64 (Native)
Parent Process: launchd [134]
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Thanks

Does it open in the guest user? If it's not enabled, you can do it from the apple >> system preferences >> users and groups. Open the lock, select the guest user account and check the box to allow logging into it.

Username 'disappeared' from System Preferences List

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