IMessage not working on iMac anymore?

Up until about two weeks ago I was able to get my iMessages on my iMac.  Now all the previous messages have the contacts name in red saying they are offline.  What's wrong?

HI,
The About the Mac item looks like this.
This happens to be OS X 10.6.8
Click that and you get the Build Number
Click the Build Number and you ge the Serial Number
As FaceTime and now other iMessage connections work I doubt if your issue is the Serial Number being missing.
If one person is Off line it could be that their iPhone is Off (not on  any network and powered down).
Scenarios include the battery running out or not being on Wifi or 3G networks.
7:45 pm      Monday; March 24, 2014
​  iMac 2.5Ghz i5 2011 (Mavericks 10.9)
 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

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