How do I fix a black display on my external monitor? (HDMI)

My HDMI port is fine and so is my cord. Tested the cord with other electronics and they displayed perfectly. When I boot to Windows 7, my Macbook will display from the HDMI to the TV. When I boot over to my Yosemite it recognizes that the TV is plugged in, but I just get a black screen. No mouse or anything. It was working the other day. Any helpful advice?

They messed up video drivers with the 10.10.3 update. There are forums all over talking about it. Yesterday they released a supplimental update, but at least in my case it didn't help. All three of my monitors just go black after 3 minutes and there is no way to make them work again without crashing the computer and restarting (which makes the OS very unhappy). As of right now, there are no repairs that I have been able to find on forums or otherwise. We may just be at Apples mercy to finally repair this issue.

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It worked perfect for me. Maybe settings should be different for your laptops. In my case I'm using a MBP 15" with a GeForce 330M.
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Make sure you have exactly same values in Switch Res X. Special attention to "Scan rate".
You can see in the capture below that it's working
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I would like to have my MacPro laptop display and 2 external monitors (three displays). Question, how can I have more than one application displayed at a time? IE: I would like email on one monitor, Finder on my laptop, and iTunes on the other. Possible?
With extended desktop, it appears that I can only have one application presenting at a time. Sort of defeats the purpose of having multiple displays.
I am using the HDMI and the mini HDMI connectors.

I would like to have my MacPro laptop display and 2 external monitors (three displays). Question, how can I have more than one application displayed at a time? IE: I would like email on one monitor, Finder on my laptop, and iTunes on the other. Possible?
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I am using the HDMI and the mini HDMI connectors.

Can I get mirrored displays on my external monitors?

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White screen, but you could get the display via an external monitor.

Hi,
A few weeks ago, my Macbook pro(A1212) stopped displaying. It only showed a white screen, but you could get the display via an external monitor. A friend looked at it and we discovered a burnt Mosfet (SI3443DV) which was item Q9400 on the motherboard. He went and changed it but it only displayed for less than 5 minutes and it went back to the white screen. would you please advice on what to do since i am not in a financial position to take it for repairs at the apple store?
Joe

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I've seen this post at least a hundred times. Has
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I don't remember where the page was. But, I posted it's link several months ago in the forums during another discussion.
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I don't have any reason to do it myself, so I'm not going to tinker with it.
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How do I fix a black display on my external monitor? (HDMI)

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