Mini-display port to hdmi cable not working consistently

I have a MacBook Pro (15-inch, Early 2011) 2GHz Intel Core i7, 4GB, Intel/ATI combo video - Yosemite 10.10.2. I purchased the monoprice 15" mini-display port to hdmi cable and it worked perfectly for about 1 month or 2. Now when i plug in the cable, the MBP doesn't detect that I have a second display connected at all. I assumed the cable died so I tested it on my iMac. The cable worked. Also when I try my Monoprice 15" mini-displayport to VGA cable, that works on my MacBook Pro. I can't figure out what is causing my MacBook Pro to "forget" how to detect this cable. Anyone out there experiencing the same? I tried PRAM reset to no avail. Any suggestions would be great.

Hello David,
If you are having issues using your external display with your MacBook Pro, check the article below to continue your troubleshooting with resetting the SMC as well. Work your way down the article if you still are having issues after that. 
Apple computers: Troubleshooting issues with video on internal or external displays
https://support.apple.com/en-us/HT201177
Regards,
-Norm G. 

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    Message was edited by: winxp
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    Hi DjTimmyM,
    Thanks for visiting Apple Support Communities.
    Start with the steps below to troubleshoot issues with video out from your MacBook Pro:
    Apple computers: Troubleshooting issues with video on internal or external displays
    http://support.apple.com/kb/ht1573
    Reset the system
    You can reset the Mac's parameter RAM and SMC.
    Best Regards,
    Jeremy

  • I just ran a software update for Java and MacBook Pro SMC, now my Mini Display Port to HDMI TV is not working. The TV is flickering. The Mac Display is fine.

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  • IMac does not recognize external monitor using Mini Display Port to HDMI

    Hello,
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    I am having the same issue.  Hope Apple can fix this soon!!!

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    Hi,
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    Hi w andersen,
    Thanks for visiting Apple Support Communities.
    If your TV is not recognized by your iMac when you connect it, I recommend the troubleshooting tips found in this article:
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    http://support.apple.com/kb/ht1573
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    About Mini DisplayPort to HDMI adapters
    Apple Mini DisplayPort adapters: Frequently asked questions (FAQ)
    Thunderbolt ports and displays: Frequently asked questions (FAQ)
    Reset the system
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    Best,
    Jeremy

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