13" (2010) MacBook Pro Display settings are showing a second "built-in" display that doesn't exist

I have a 13" mid-2010 MacBook Pro, running OS X 10.10.2
I also have an LG 23MP75 monitor attached, at a resolution of 1920 x 1080 (60Hz) using the display port to a VGA adapter. This is my standard configuration for in the office.
When I attached my laptop this morning, and logged in to my user id, my monitor wasn't in it's normal "location" -- that is, I couldn't drag the cursor to the left off my laptop desktop and onto the second monitor. I opened up my System settings and discovered the most unusual monitor configuration I've seen...
What makes it unusual is that I don't have a third monitor attached.
The left-most screen is my laptop, the right-most screen is my external display, and the centre "screen" shows as a "Built-in Display" at 1536 x 2048 resolution.
I have unplugged and re-plugged the display adapter; I have detected displays (with and without the external monitor attached). I haven't yet rebooted (as I wanted to get screen shots in case the problem "goes away.") and the centre display persists.
I can rearrange the displays, and put the external back to where I normally have it, but that ghost display still sits there.
I have had minor problems in the past, when I switch from my external monitor to a projector and then come back to my monitor - the MacBook doesn't always remember the screen resolution and I've had to Detect Displays, and sometimes reset the resolution manually. But it's a minor issue; given that I'm swapping external devices in and out while my computer is asleep, it doesn't surprise me.
I have used iScreen in the past to extend my desktop onto my iPad, but the iScreen preference is currently turned off AND I'm not using my iPad, nor is it currently on the same wifi network as my laptop (on a hunch, I turned off my wifi, but the ghost display persisted).
Two questions:
1) Where did this "ghost display" come from?
2) More importantly, how do I get rid of it?

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Hi Cyberviper42,
I understand that you are seeing some issues with your connection to the internet on your computer. I have an article for you that will help you troubleshoot this issue:
Wi-Fi: How to troubleshoot Wi-Fi connectivity - Apple Support
https://support.apple.com/en-us/HT202222
Thanks for coming to the Apple Support Communities!
Regards,
Braden

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< Email Edited By Host >

Spill Cleaning
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Don't use a hair dryer on it (even at a low setting a hair dryer will damage sensitive components).

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Message was edited by: afrah000

Welcome to Apple Support Communities
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Back up all data before making any changes.
Step 1
Take all the applicable steps in this support article.
Step 2
If you're running OS X 10.8.4 or later, run Wireless Diagnostics and take the remedial steps suggested in the summary that appears, if any. The program also generates a large file of information about your system, which would be used by Apple Engineering in case of a support incident. Don't post the contents here.
Step 3
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Step 4
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Triple-click the line below on this page to select it:
/Library/Preferences/SystemConfiguration
Right-click or control-click the highlighted line and select
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Go ▹ Go to Folder...
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Reset the System Management Controller.
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Make a "Genius" appointment at an Apple Store, or go to another authorized service center.
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Keeping your confidential data secure during hardware repair
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Start with visits to: OS X Maintenance - MacAttorney;
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Repair the Hard Drive - Lion/Mountain Lion
Boot from your Lion Recovery HD. When the recovery menu appears select Disk Utility. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list. In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive. If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported, then click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the main menu. Select Restart from the Apple menu.
Boot to the Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
Restart your computer normally and see if this has helped any. Next do some maintenance:
Suggestions for OS X Maintenance
For situations Disk Utility cannot handle the best third-party utility is Disk Warrior; DW only fixes problems with the disk directory, but most disk problems are caused by directory corruption; Disk Warrior 4.x is now Intel Mac compatible.
OS X performs certain maintenance functions that are scheduled to occur on a daily, weekly, or monthly period. The maintenance scripts run in the early AM only if the computer is turned on 24/7 (no sleep.) If this isn't the case, then an excellent solution is to download and install a shareware utility such as Macaroni, JAW PseudoAnacron, or Anacron that will automate the maintenance activity regardless of whether the computer is turned off or asleep. Dependence upon third-party utilities to run the periodic maintenance scripts was significantly reduced since Tiger. These utilities have limited or no functionality with Snow Leopard or Lion and should not be installed.
OS X automatically defragments files less than 20 MBs in size, so unless you have a disk full of very large files there's little need for defragmenting the hard drive. As for virus protection there are few if any such animals affecting OS X. You can protect the computer easily using the freeware Open Source virus protection software ClamXAV. Personally I would avoid most commercial anti-virus software because of their potential for causing problems. For more about malware see Macintosh Virus Guide.
I would also recommend downloading a utility such as TinkerTool System, OnyX 2.4.3, or Cocktail 5.1.1 that you can use for periodic maintenance such as removing old log files and archives, clearing caches, etc.
For emergency repairs install the freeware utility Applejack. If you cannot start up in OS X, you may be able to start in single-user mode from which you can run Applejack to do a whole set of repair and maintenance routines from the command line. Note that AppleJack 1.5 is required for Leopard. AppleJack 1.6 is compatible with Snow Leopard. There is no confirmation that this version also works with Lion.
When you install any new system software or updates be sure to repair the hard drive and permissions beforehand.
Get an external Firewire drive at least equal in size to the internal hard drive and make (and maintain) a bootable clone/backup. You can make a bootable clone using the Restore option of Disk Utility. You can also make and maintain clones with good backup software. My personal recommendations are (order is not significant):
     1. Carbon Copy Cloner
     2. Data Backup
     3. Deja Vu
     4. SuperDuper!
     5. SyncTwoFolders
     6. Synk Pro
     7. Synk Standard
     8. Tri-Backup
Visit The XLab FAQs and read the FAQs on maintenance, optimization, virus protection, and backup and restore.
Referenced software can be found at CNet Downloads or MacUpdate.
Additional Hints
Be sure you have an adequate amount of RAM installed for the number of applications you run concurrently. Be sure you leave a minimum of 10% of the hard drive's capacity as free space.
Add more RAM. If your computer has less than 2 GBs of RAM and you are using OS X Leopard or later, then you can do with more RAM. Snow Leopard and Lion work much better with 4 GBs of RAM than their system minimums. The more concurrent applications you tend to use the more RAM you should have.
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Check for applications that may be hogging the CPU:
Open Activity Monitor in the Utilities folder. Select All Processes from the Processes dropdown menu. Click twice on the CPU% column header to display in descending order. If you find a process using a large amount of CPU time, then select the process and click on the Quit icon in the toolbar. Click on the Force Quit button to kill the process. See if that helps. Be sure to note the name of the runaway process so you can track down the cause of the problem.
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13" (2010) MacBook Pro Display settings are showing a second "built-in" display that doesn't exist

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