External Monitor Not Working after 10.9.3

I have two Macs which are not working with an external monitor anymore through the thunerbolt port. I have tried different types of connections (HDMI and DVI) and two different external monitors in an attempt to determine the issue. The only common denominator to the issue is the update to 10.9.3 OS X. I have also reset PRAM and changed between mirroring and non mirroring to no avail.
Mac #1:
MacBook Pro8,1
Intel Core i5
2.4ghz
Intel HD Graphics 3000 512MG
External Monitor: Resolution 1920X1080 @60hz
32 Bit Color (ARGB8888)
Main Display: Yes
Mirror: Off
Online: Yes
Rotatino: Supported
Mac#2:
MacBookAir6,2
Intel Core i5
1.3ghz
Intel HD Graphics 5000
External Monitor: No information as it's not connected at this time.

Well low and behold I tried clearing PRAM again and I reset my monitor to factory defaults. Reconnected my monitor and the thing works now. Very strange but I'm Happy that it's working again. *WHEW*

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