All of a sudden I'm getting the hdcp error on my iMac

yeh on my imac not an external display

What hardware do you have installed?
All of it please.. and roles and function of each item.
ISP.. modem??.. main router?? .. AE of some sort?? ..
Have you reboot all of this and start up in correct order.. exactly as pictured above in exactly the sequence.. left to right. 2min between each.
If you installed Yosemite on your MBP .. welcome to the club.. networking is pathetic.
Reset the PRAM and whatever else.. wireless.. can be a total pain on Yosemite.

Similar Messages

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    What hardware do you have installed?
    All of it please.. and roles and function of each item.
    ISP.. modem??.. main router?? .. AE of some sort?? ..
    Have you reboot all of this and start up in correct order.. exactly as pictured above in exactly the sequence.. left to right. 2min between each.
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    Sometimes CUDA causes problems. Try checking for an update and/or un-installing it. Un-install using the developer’s instructions to make sure you remove all parts of the application.
    Activity Monitor - Mavericks  also Yosemite
    Activity Monitor in Mavericks has significant changes
    Performance Guide
    Why is my computer slow
    Why your Mac runs slower than it should
    Slow Mac After Mavericks
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    Configuring 802.1X in Mac OS X Lion and Later

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    Hi Tom,
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