MacBook Pro 13 doesn't see external monitor

Hello!
Today I put my macbook with an external monitor to sleep. After I woke it up, the macbook can't see my external monitor anymore.
What can be the problem & solutions?
Thanks in advance!

Still need help. When I put my cable in the macbook the screen goes blue for 2 seconds and nothing happens, no image on the external display

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Guys:
My Mac Pro doesn't see all three of the monitors that I have hooked up...what am I doing wrong?
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I read your links, if I understand correctly, it may work with Dual Link DVI adapters?
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Note: The Apple Mini DisplayPort to Dual-Link DVI adaptor and Apple Mini DisplayPort to VGA adaptor are considered active adaptors.
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Hi,
I deal with very similar issues. I have Samsung S24C650PL 1080p (connected with HDMI), which I bought one year ago. I used it a lot with Windows without any issues. Last week I bought my first Macbook Pro Retina and since than it is a pain.
All fonts are significantly more blurred than with Windows.
Especially scanned PDFs are horrible, very difficult to read, much worse than the rest of the system.
What is, however, really weird, if I move the Preview app with the PDF from the internal display to the external, it shows the right and sharp image for cca one second before it becomes blurred. So it is obviously software-related issue.
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Deactivate "Use LCD font smoothing when available" --> no effect at all
Deactivate "Smooth text and line art" --> no effect
Use any possible settings in "Displays" --> no effect
Call the Apple support and talk with them for 40+ minutes --> no effect and no help
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Install Acrobat Adobe, which uses obviously a different rendering engine than Preview app. (However, I don`t like the app.)
Install Foxit Reader for Windows under Wine (even that is much better than Preview app.)
I am pretty frustrated with these issues, because I thought Apple cares a little bit, but it is simply not true.
And I can`t understand why MacBook Pro Retina can`t render the fonts at least so well as a cheap notebook for 200+ euros.

MacBook Pro 13 doesn't see external monitor

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