IMessage Failing on iMac

I have an iPhone 5s, iPad 2, brand new iMac and 2010 Macbook Pro.  iMessage started acting up about a week ago on all devices.  Basically, when I try to send an iMessage from my iPhone it fails and then most of the time it immediately sends.  Sometimes, it wont send at all.  My iMac won't send at all. The iPad sends sometimes, same with the Macbook Pro.  I have logged out of all accounts for a minute and then logged back in. I have logged out of all accounts, logged out of all iCloud accounts, logged back in. I have reset network settings on my iPhone. Lastly, I just reset my PRAM on my iMac and it still isn't working. 
Any ideas?

Hi,
Is this in one location using one router for all devices ?
Obviously iPhone and iPads could be moving between networks and in the case of an iPhone it could be relying on the Carrier's 3G coverage if there is no Wifi.
On the Mac is the Firewall On ?
If so, is Messages allowed ?
If you router allows it try adding a Public DNS server rather than relying on the ISP ones.
8:47 pm      Tuesday; April 29, 2014
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 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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