Mouse movement affects screen ^^

Hey there , i turned on my iMac today this morning and i noticed , that when i move my mouse around the screen , my screen moves a bit , and when i move it on to text , the text goes funny , when i dont move the mouse my screen is perfectly fine !
I tried to use another mouse but its still the same :S
what happened here , what can i do to fix this ?

Thanks a lot
worked

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