MacBook Pro 9,1 External Monitor Blanks Out?

I have a 15-inch, Mid 2012 MacBook Pro with a 2.3 GHz i7 processor, which I purchased last December. For some reason my external monitors blank out about 1-3 times per day. As far as I can tell the symptons are not reproducable. It just seems to randomly happen.
Has anyone else had this problem and if so, what was the solution?
Thanks!

Are you sure it is not a hardware problem? A bad cable or a poor connection?
I would try this after eliminating hardware causes.
Go to System Preferences / Displays. Verify the settings are correct, and correct or not change them arbitrarily - just move the settings back and forth - and then set them back where you want them.
Now reset the PRAM:
Shut down your Mac.
Locate the following keys on the keyboard: Command (⌘), Option, P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on the computer.
Press and hold the Command-Option-P-R keys before the gray screen appears.
Hold the keys down until the computer restarts and you hear the startup sound for the second time.
Release the keys.

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nchelliah wrote:
Thanks for your help What about a HDMI to VGA cable? Would this work?
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MacBook Pro 9,1 External Monitor Blanks Out?

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