MacBook Pro Retina Wont Connect back to Monitor

Hey Everyone,
I have a MacBook Pro Retina Early 2013 15in that is running OS X Yosemite - 10.10.2 - Graphics Card: NVIDIA GeForce GT 650M 1024 MB
At Work for the past 1.5 years i have been connecting to a Dell Monitor via a DVI to HDMI Cable to use as my primary screen and have never had any issues. During the day I often present on the projector in the BoardRoom a Dell 4610X using a direct HDMI cable.
The issue: Ever since I have updated my laptop to Yosemite, every time i connect my macbook to my monitor after its been connected to the projector it will no longer connect. The monitor will recognize that there is something connected but it wont show anything. Even if i try another display in the office the same thing happens. The issue will always resolve if i restart the computer.
Recently I had an issue with the Logic Board and it was replaced by an Apple Certified repair shop. This issue was happening even before the logic board was replaced and it is still having the same issues now, so I don't believe its an hardware issue.
Although this issue is not critical, its a nuisance to re-start my laptop each time i get back to my desk after a meeting in the boardroom...
I would high appreciate some help on this!!
Thanks in Advance

Something else to check ..
Open System Preferences > Network then select the Wi-Fi tab.
Drag the school wi fi network name to the top of the list.
You can open System Preferrences by clicking the System Preferences icon in your Dock
Or click System Preferences from your Apple menu icon top left in your screen.
Or, from your Applications folder.
message edited by;  cs

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