I built a Hackintosh a while ago, and it's had this problem since I built it. The curser seems to randomly accelerate/jump while moving the mouse as steady as possible across the screen. Here is a list of things that may help diagnose the problem. • Happens with USB mouse, or my MagicMouse. • Everything works fine in Windows. • It only seems to happen in horizontal movements, never vertical. • I've used several different mouse pads, no change. I think that's it. I don't really think it has anything to do with it being a hackintosh, but I will start up using the Snow Leopard Disk to see if the problem is still there. I would really appreciate any suggestions.