IMAC and external screen--screen flickering and erratic mouse behavior

I have purchased a screen Medion 25.5 inch to connect it to my IMAC 27 inch.
I have noticed two unexpected behaviours:
- from time to time, after the IMAC comes out of the SLEEP mode, the external screen is flickering, I need to put the IMAC to sleep one or several times before the display of the external screen becomes stable.
- since I connected the external screen, the behavior of the mouse is highly erratic, eg when I move the mouse by a fraction of a millimeter, the display of the mouse pointer moves by half a screen, or even disappears completely. I have performed many tests, with several apple mice, a Dell mouse and a Microsoft mouse. As soon as I completely disconnect the screen (not only power the screen down) the mouse works normally again. I have now decided to stop using the external screen until a software update resolves the situation.
Any advice?
Patrick

When my 2008 24" iMac started to die from overheating, two of the symptoms I would see would be white flickering from the bottom going about half way up, like it was going blank and repainting the screen over and over. Also, the mouse pointer would jump erratically to all the edges and corners of the screen. After a few seconds, it might recover or it might freeze. I would use a program like iStat Pro to see what your temps are when you attach that screen. I suspect it may be excess heat due to the GPU now pushing two screens instead of 1?
Also try diags, and all those reset thingies people keep mentioning over and over.
First and foremost, if you have coverage, contact a "genius" and let him belittle you with his expertise.

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