Can't sign into iMessage or Facetime using OS X 10.8

HI,

Open Activity Monitor (Applications/Utilities)

Find imagent (Lower case)

Highlight and use the Quit button (you may need to confirm Force Quit).

Restart Messages (Which will relaunch IMAgent).

IMAgent is used by both FaceTime and Messages and is involved with the Login processes of both apps.

This is not always successful (it seems there may be several causes to what looks like the same symptoms).

If that does not work use the Finder > Go Menu > Go to Folder and type (Copy and paste) ~/Library/Preferences into the dialogue box.

Find com.apple.imservices.iMessages.plist and Drag it to the Trash

Relaunch Messages.

If that does not work delete (Drag to Trash) com.apple.imessages.bag.plist

Restart Messages (Again)

9:59 PM Wednesday; November 14, 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 an iPad
"Limit the Logs to the Bits above Binary Images."  No, Seriously

HI,

Any chance this Mac has been refurbished or repaired ?

The only definite cause we have found with this symptom so far is a Missing Serial Number to the Motherboard.

In the System Information (Apple Menu > Hold ALT Key and select top item)

In Hard ware the Serial number of the device/motherboard is listed.

If Repaired it is supposed to be re-flashed back to the board.

Certain apps use this as a security check when "registering" for use.

10:25 PM Wednesday; November 14, 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 an iPad
"Limit the Logs to the Bits above Binary Images."  No, Seriously

HI,

Does the System Information app tell you that this is or is not a Serial Number ?

My understanding is that a Certified Apple Repair place have the tools to replace the serial number.

7:10 PM Thursday; November 15, 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 an iPad
"Limit the Logs to the Bits above Binary Images."  No, Seriously

Hello.

I have the same problem.

I tried everything you say to do and i still have de same problem. When i try to connect with my apple id the message is the same: Serve find an error. Try later....nothing worked so far.

Thank you