Macbook screen flickers on connecting an external screen

Dear all,
My Screen starts flickering on connecting an external monitor. It seems like if my Macbook wants to change its resolution to 1920x1200.
I have already resetted my Macbooks PRAM.
I have recorded a video to show you my problem:
http://www.youtube.com/watch?v=2-Yz-Em2GU4
Sorry for my English.
Kind Regards,
Vuk

push

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Hello ,
Thanks for using Apple Support Communities.
Please follow the steps below to troubleshoot having no display on the external display.
No video or no signal, image distortion, "snow," or flickering
Check connections
When using an external display be sure to check the following:
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Monitor and Display Adapter Table
About Mini DisplayPort to HDMI adapters
Apple Mini DisplayPort adapters: Frequently asked questions (FAQ)
Thunderbolt ports and displays: Frequently asked questions (FAQ)
Remove all display cable extenders, KVM switches, or other like devices and retest to determine if the issue is resolved.
Try unplugging the video adapter or cable and then plug it back in.
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janpd24 wrote:
I have a thin white flickering line (about 2" long) at the top of my MacBook screen -- in the area just to the right of the iSight, along the top of the screen, to be precise. It's a white flicker, so only visible when I dim the screen or there's a dark background, so there's no way of telling how long it's been there.
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Message was edited by: EZ Jim
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Message was edited by: sdpitbull to add Update section.

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Macbook screen flickers on connecting an external screen

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