So rediculous, that I also as a graphic designer (which ive seen a few on here) who need their **** externals are dealing with this. Somehow it resets mine everytime, and my macbook redectects the monitor. make sure your monitor is already set to the right video (ie dvi, hdmi etc) Unplug the monitor Power cable, then plug in your cable (ie mine is DVI) to your macbook, (the screen should go blue for a sec.) Then, only then once your screen comes back, plug in the power cable to the monitor. The following solution worked like magic. I searched a lot till I found this and this answer! I thought it was a cable problem and plugged it into my Macbook Air and the dislay worked just fine! Hopefully one of the fixes above worked for you. Now check to see if your MacBook Pro sound works now. This should reset the SMC on your MacBook Pro. I tried a lot of restarts, plug-ins and plug-outs. 2) Press the Shift, Control and Option keys on the left side on your keyboard and the Power buttons at the same time. If it doesn't, they will have extra adapters to rule out that possibility.
My displayport of Macbook Pro 2011 edition stopped working. Another way to test this is go to an App Store or similar with your machine and your cable. This includes items that are defective in ways that render them difficult to use, items that require service or repair, or items missing essential components. Read more about the condition For parts or not working: An item that does not function as intended and is not fully operational.
Apple has issued no statements on the issue even though it's been well documented for over a year. Basically the soldering of the GPU on 2011 15' and 17' was defective. OK! I hate ridiculous solutions, but this actually seems to work! Apple MacBook Pro A1286Laptop - MC723LL/A (February, 2011). If you still are not receiving sound through your adapter, try plugging/unplugging it, or starting your computer up with your display port hooked up, to ensure. You have the issue as described (many times over) in this -> 2011 MacBook Pro and Discrete Graphics Card - thread. 5 October 2018 / Hacks Solved : Displayport of Macbook 2011 (Early) not working
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