15" MacbookPro won't detect external monitor.

I have a MacbookPro and a Samsung external monitor. I have them set up and ready to roll but my MBP wont detect the external monitor, so I can't get the screens to share. Please help me with how to detect and configure this.

Try resetting the PRAM and the SMC, in that order:
http://support.apple.com/kb/HT1379?viewlocale=en_US&locale=en_US
http://support.apple.com/kb/HT3964

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    Hello there, willr314.
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    http://support.apple.com/kb/ht1573#1
    No video or no signal, image distortion, "snow," or flickering
    Check connections
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    Monitor and Display Adapter Table
    About Mini DisplayPort to HDMI adapters
    Apple Mini DisplayPort adapters: Frequently asked questions (FAQ)
    Thunderbolt ports and displays: Frequently asked questions (FAQ)
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    These articles may offer additional assistance and information about displays and video adapters:
    Apple Portables: How to use your computer in closed lid mode with an external display
    Apple Cinema Display (30-inch DVI) has 1280 x 800 as the maximum available resolution
    Mac Pro (Early 2009), Mac Pro (Mid 2010): Supported display configurations
    For assistance with Retina displays, please see Frequently asked questions about using a Retina display.
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    Note: Diagnostic fees may apply for issues not covered under warranty or the AppleCare Protection Plan (APP).
    Thanks for reaching out to Apple Support Communities.
    Cheers,
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    I even reset PRAM, and installed 10.8.2 Supplementary update.
    I also plugged and unplugged all I could, with no luck.
    As I can see on Apple discussion, it is a common problem with 2011 MacBook Pro's.
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  • Can't detect external monitor, shows only 640x480

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