Hey ya all, So I got this new iMac.. 27", its literally 2 months old.. they problem is that when I try and scroll with the "magic mouse" its way jittery to the point where I can see blocks moving across the screen. Swpiing sideways get s the same reaction.. I have office, autocad and adobe suite installed. Grateful for any assistance before I throw the screen over my balcony! (dont mean that literally..) If it would help, I can upload a video of my pain.. PS: been to the "genius bar".. they replaced the mouse and sent me on my way..