MiniDisplay to VGA adapter YouTube HD Flicker

Hi,
I've recently got the Apple MiniDisplay port to VGA adapter for my mid-2010 Macbook Pro (2.4GHz i5, 4GB RAM, nVidia GT330M with switching), and have it hooked up to a relatively old Samsung SyncMaster 2223NW widescreen LCD monitor. I'm running the laptop side by side with the monitor (not in clamshell). For the most part this works great, though I have noticed the CPU and the GPU Diode run at least 10 degrees warmer than they would when just using it as a laptop. The problem comes in when watching HD (720p or 1080p) video on YouTube. During playback it seems to cause strange black lines/artifacts which flicker all over the screen. Standard Def video is fine, only happens with HD content. I don't know whether this is an indication that the GPU is overworked (though the temperature seems to be within normal limits) or something to do with the analogue VGA connection or the adapter itself. Anyone know what's causing this?
Thanks,
Tom

Yup, am in the same boat. I know of at least one other thread talking about the same issue:
https://discussions.apple.com/message/18859409#18859409 .

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i have a macbook pro. i want to connect it to projector and i have a minidisplay to vga adapter. i could connect my MBP to benq projector successfully and for all other displays( Monitors). but when i connect it to optoma projector, MBP detects the display as OPTOMA XGA but nothing on bigger screen. i tried changing the resolution and refresh rate also but no changes.
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and also i want to say that there is no problem with the optoma projector seems, because all other windows laptops are working well with that.
i was struggling with this since one month. i googled it could not find anything supportive for my problem. please help me regarding this. i am new to apple. i hope there must be genius around here.
thnak you

Rwogera wrote:
I couldn't transmit sound either, do i need another cable like Kim said? i mean it cant be transmitted through this HDMI port? as for me i have one of the latest mac pro with intel core i5..tnx
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IMac MiniDisplay to VGA stops sending signal to Analog Way switcher

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Macbook air 2014 model screen flickers when ever it is connected to minidisplay port to vga adapter?

Hello EmPuah,
The article linked below details a number of troubleshooting steps that can help resolve issues with your display.
Apple computers: Troubleshooting issues with video on internal or external displays
http://support.apple.com/en-us/HT201177
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Hi Veterans,
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Hi BMBell1919
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See the Tip in > http://support.apple.com/kb/TA23844
{quote:}Tip: To make sure that your iMac automatically detects the external display or projector, be sure you plug the adapter into the external display or projector before you plug it into the iMac.{quote}
Dennis

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Problem solved. I picked up the MDP to VGA adapter and was able to use the monitors native res of 1920x1200 but the flicker and wavyness made it impossible to use. And yes the adapter had the current firmware. But what I discovered in the process was that in mirror mode I am unable to drive the monitor at optimum resolution. With that in mind I tried the MDP to HDMI adapter again, unchecking mirror mode, moving the Finder bar to the external display and SHAZAM. I have a rock solid display external display now running at 1920x1200 : )

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MiniDisplay to VGA adapter YouTube HD Flicker

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