I cannot login into iMessage on my iMac.

Question

I cannot login into iMessage on my iMac. Works with MacBook Air 11". Restart and reinstall made no change. Any ideas where the problem might be?

Answer 1

Hi,
The red indicators appears for regular iChat Buddy type chats as well as iMessages types in the Messages beta.
From my own experience and reading some of the posts here it seem that sometimes that they don't inform you correctly.
Part of the issue seems to be the way the Apple servers cope with periods of high demand.
This seems to somewhat akin to using the internet during the late '80s and early '90s when yiou could tell when America woke up.
I have one red Indicator here that shows.  A Buddy sent some IMS when I was Off Line.
However I had changed a Setting in Messages to test something and this allowed the IMs to fire up Messages.
It does not say they went Off line, which iChat used to do, (although they do not show in My Buddy list) so I tried a reply anyways (thinking they were set up for Ofg Line IMs)
I did not get a message they they don't take Off Line IMs but I got the red indicator.
Another one I have seen is an iMessage issue.
I get the noise that  a Message was sent (to phone) but nothing appears in the Messages Main windows as the Chat.
If the person replies to the Messages it is the only way you know the message got through (other than checking your linked iOS 5 device which shows the Synced version).
Clicking any red indicator tends to shopw you a drop down from the top of the window that offers to try again of Cancel.
Summary.
I have seen some appear that don't seem valid (i.e to my Phone when the phne was on - and on the same Wifi network).
I have seem posts of the same.
I have also seen the situation where there should be red indicators and there are not.
In addition to this some of the messages in Buddy Lists that iChat showed (as in  Buddy going Off line when a Chat window was open) seemed to have disappeared from the Messages beta.
At present I have not found anything that seems to improve the situation - in fact it is sometimes difficult to tell  if the indicator is "right" or "wrong".
As Apple have set up the Forum for Messages beta but no other feedback route,  they will, hopefully, be following many of the threads in these discussions.
7:18 PM      Monday; April 2, 2012
Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"
  iMac 2.5Ghz 5i 2011 (Lion 10.7.3)
 G4/1GhzDual MDD (Leopard 10.5.8)
 MacBookPro 2Gb (Snow Leopard 10.6.8)
 Mac OS X (10.6.8),
"Limit the Logs to the Bits above Binary Images."  No, Seriously