My iMac tries to connect to old network startup

Greetings,
When I start up, I receive a message that my computer is trying to connect to the my old iMac, the one that I used with Migration Assistant to transfer files and such. That computer is no longer around, but the new one always searches for it.
I have looked in Startup items, Airport preferences, recent servers in the Connect to Server part of the Finder, and found that there is an icon for "Network Startup" with a ? that I assume is the culprit. However, there is no obvious way to delete or cancel this.
I checked the following discussion threads for answers:
https://discussions.apple.com/message/13272616#13272616
https://discussions.apple.com/message/5317530#5317530
There were many useful suggestions, but so far no luck. There might be more out there, but I have been looking for a while now.
Any help would be much appreciated.
Thanks
Ken

Look in System Preferences > Accounts > Login Options > See if there is a Network Account Server defined. If so, remove.
Sounds like it's looking for a remote boot option.
Regards,
Captfred

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Step 2
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In the Finder, press the key combination command-K or select
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Open the Printers & Scanners pane in System Preferences and delete any network devices you no longer use.
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Triple-click anywhere in the line below on this page to select it, then copy the text to the Clipboard by pressing command-C:
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Open the folder
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Log out and back in again, and test.
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Disconnect all wired peripherals except those needed to start up. Start up in safe mode. Test. After testing, restart as usual (not in safe mode) and verify that you still have the problem.
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Step 10
Triple-click the line below to select it:
/System/Library/CoreServices/Directory Utility.app
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Open the following file as you did in the last step:
/etc/auto_master
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# Automounter master map
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/net               -hosts          -nobrowse,hidefromfinder,nosuid
/home               auto_home     -nobrowse,hidefromfinder
/Network/Servers     -fstab
/-               -static
If there are any other lines in the window, post them. Otherwise, close the window.

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Cheers,
Since mountain lion and also with mavericks I have had an annoying issue with my iMac. Some background .. I have used migration assistant to move from one MBP to a newer unibody MBP and then again also to 'clone' my unibody MBP setup to my iMac. For some reason my iMac has fallen in love with the unibody MBP in that it insists on connecting to this on startup. I consistently get the following dialog on startup where the server reference is to the network name of my MBP.
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Step 1
If you get the alert as soon as you log in, it's probably caused by one of your login items or by software that otherwise loads at startup or login. Ask if you need help identifying it. A known offender is "AdobeResourceSynchronizer," which is a component of some Adobe products. See also this discussion.
If you get the alert in the login screen before you log in, stop here and ask for instructions.
Step 2
If there's an icon representing the server in the sidebar of a Finder window, hold down the command key and drag it out.
Step 3
In the Finder, press the key combination command-K or select
          Go ▹ Go to Server...
from the menu bar. In the upper right corner of the window that opens is a Recent Servers popup menu represented by a clock icon. From that menu, select
          Clear Recent Servers…
and confirm. Test.
Step 4
Open the Printers & Scanners pane in System Preferences and delete any network devices you no longer use.
Step 5
Triple-click anywhere in the line below on this page to select it, then copy the text to the Clipboard by pressing command-C:
~/Library/PDF Services
In the Finder, select
          Go ▹ Go to Folder...
from the menu bar and paste into the box that opens by pressing command-V. You won't see what you pasted because a line break is included. Press return. A folder may open. If it does, move the contents to the Desktop, or to a new folder on the Desktop. Log out and log back in. Test. If there's no change, put the items you moved back where they were and continue.
Step 6
Open the folder
~/Library/Preferences
as in Step 5 and move the file named "loginwindow.plist" items in that folder to the Trash, if it exists (it may not.)
Log out and back in again, and test.
Step 7
Other possible causes are references in the iPhoto, iTunes, or iMovie library pointing to the server, and bookmarks in the Preview application.
Try rebuilding the iPhoto library.
Step 8
Triple-click the line below to select it:
/System/Library/CoreServices/Directory Utility.app
Rght-click or control-click the highlighted text and select
          Services ▹ Open
from the contextual menu.* The application Directory Utility will open.
In the Directory Utility window, select the Directory Editor tool in the toolbar. Select Mounts from the Viewing menu in the toolbar, and /Local/Default from the node menu, if not already selected. On the right is a list of names and values. By default, the list is empty. If it's not empty, post a screenshot of the window and stop here.
*If you don't see the contextual menu item, copy the selected text to the Clipboard (command-C). Open a TextEdit window and paste into it (command-V). Select the line you just pasted and continue as above.
Step 9
Open the following file as you did in the last step:
/etc/auto_master
It will open in a TextEdit window. The contents should be exactly this:
# Automounter master map
+auto_master          # Use directory service
/net               -hosts          -nobrowse,hidefromfinder,nosuid
/home               auto_home     -nobrowse,hidefromfinder
/Network/Servers     -fstab
/-               -static
If there are any other lines in the window, post them. Otherwise, close the window.

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I have reset my iMac aswell as shut it down and turned it on from cold, no luck. I have also tried to connect to my iPhone's hotspots functionality with no joy.
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For the software update it has to be initiated by the user, unless you have it set to update automatically.
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My iMac tries to connect to old network startup

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