HT1338 early 2012 macbook air clamshell mode not working after mountain lion update

Can't make 2012 MBA 13" work in clamshell mode after updating to Mountain Lion. All peripheral devices are connected, as is AC power. Closing lid causes external monitor to enter sleep mode (presumably, the MBA is going to sleep as well).
Power settings are set to stay awake when on AC power.
Thank you.

Hi,
The two may be linked as there is a common support app called IMAgent that helps with both Messages and FaceTime.
Shut down both apps.
With the Finder as the Front App > use the Go Menu > Hold down ALT key and select Library.
In the Library find and open th Preferences Folder
Find com.apple.IMAgent.plist and drag it to the Trash
Before restarting the App now go to Activity Monitor in Applications/Utilities.
Find imagent (it is in lower case).
Highlight and use the Quit button.
Now restart the app(s).
This will recreate the .plist from defaults.
8:34 PM Thursday; September 27, 2012
Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"
 iMac 2.5Ghz 5i 2011 (Mountain Lion 10.8.2)
 G4/1GhzDual MDD (Leopard 10.5.8)
 MacBookPro 2Gb (Snow Leopard 10.6.8)
 Mac OS X (10.6.8),
 Couple of iPhones and and iPad
"Limit the Logs to the Bits above Binary Images."  No, Seriously

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Facetime not working after Mountain Lion update

I have a Macbook Pro. After I updated to Mountain Lion (from Lion), Facetime no longer works. I've tried with multiple people, but they aren't receiving my calls and I'm not receiving their calls. In Lion Facetime worked fine, but now it's not working. I also can't get iMessages to work. This is very frustrating, because I was really looking forward to iMessages. My Macbook Pro is still new, I purchased it in the first week August (2012). It came with Lion already installed. It's only 2 months old now. So I know my computer can support all of Mountain Lion's features. By the way, I'm running on Mountain Lion 10.8.2. Any help would be great! Thanks

Hi,
The two may be linked as there is a common support app called IMAgent that helps with both Messages and FaceTime.
Shut down both apps.
With the Finder as the Front App > use the Go Menu > Hold down ALT key and select Library.
In the Library find and open th Preferences Folder
Find com.apple.IMAgent.plist and drag it to the Trash
Before restarting the App now go to Activity Monitor in Applications/Utilities.
Find imagent (it is in lower case).
Highlight and use the Quit button.
Now restart the app(s).
This will recreate the .plist from defaults.
8:34 PM Thursday; September 27, 2012
Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"
 iMac 2.5Ghz 5i 2011 (Mountain Lion 10.8.2)
 G4/1GhzDual MDD (Leopard 10.5.8)
 MacBookPro 2Gb (Snow Leopard 10.6.8)
 Mac OS X (10.6.8),
 Couple of iPhones and and iPad
"Limit the Logs to the Bits above Binary Images."  No, Seriously

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Hi, this has worked for a few...
Make a New Location, Using network locations in Mac OS X ...
http://support.apple.com/kb/HT2712
old... http://docs.info.apple.com/article.html?artnum=106653
Hi, this has worked for a few...
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http://support.apple.com/kb/HT2712
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BrianForbesColgate wrote:
Thanks, Barney ...
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Is it necessary to upgrade to OSX Server if I wish to use the server a Time Machine target for Mabooks running Mountain Lion?
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Hi,
The two may be linked as there is a common support app called IMAgent that helps with both Messages and FaceTime.
Shut down both apps.
With the Finder as the Front App > use the Go Menu > Hold down ALT key and select Library.
In the Library find and open th Preferences Folder
Find com.apple.IMAgent.plist and drag it to the Trash
Before restarting the App now go to Activity Monitor in Applications/Utilities.
Find imagent (it is in lower case).
Highlight and use the Quit button.
Now restart the app(s).
This will recreate the .plist from defaults.
8:34 PM Thursday; September 27, 2012
Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"
 iMac 2.5Ghz 5i 2011 (Mountain Lion 10.8.2)
 G4/1GhzDual MDD (Leopard 10.5.8)
 MacBookPro 2Gb (Snow Leopard 10.6.8)
 Mac OS X (10.6.8),
 Couple of iPhones and and iPad
"Limit the Logs to the Bits above Binary Images."  No, Seriously

Internet sharing from Wifi to Ethernet is not working after Mountain Lion upgrade

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tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on en0, link-type EN10MB (Ethernet), capture size 65535 bytes
17:04:42.617423 IP 192.168.6.3 > 8.8.8.8: ICMP echo request, id 12095, seq 1035, length 64
17:04:43.617545 IP 192.168.6.3 > 8.8.8.8: ICMP echo request, id 12095, seq 1036, length 64
17:04:44.617468 IP 192.168.6.3 > 8.8.8.8: ICMP echo request, id 12095, seq 1037, length 64
17:04:45.617274 IP 192.168.6.3 > 8.8.8.8: ICMP echo request, id 12095, seq 1038, length 64
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HT1338 early 2012 macbook air clamshell mode not working after mountain lion update

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