External Disply flickers and went Black for a short duration after yosemite update 10.10.2

hi,
i got a mac book pro late 2008 and since todays update my external monitor flickers and went black for a short duration.
It seems that it happens, when i start a new app or i move a window across the displays.
Disabling the automated scaling of the resolution reduced the flickering but it still happens.
Does anyone faces the same problems and have an idea how to fix it?
I would appreciate it.
Sincerely
Lukas

Hello lukasfromholzwickede, 
Thanks for participating in the Apple Support Communities. 
It sounds like you've noticed flickering on your external display after updating OS X Yosemite. 
I'd recommend starting with these resets to troubleshoot the situation:
You can reset the Mac's parameter RAM and SMC.
You can find these steps in this article:
Apple computers: Troubleshooting issues with video on internal or external displays - Apple Support
If the behavior continues, try going through the steps in the "Update your software and firmware" and "No video or no signal, image distortion, 'snow,' or flickering" sections of this article, as well. 
All the best,
Jeremy 

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