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Starting today, my mouse cursor is moving by itself. Here's a video of it:

I use a MacBook Pro with an external display and a magic mouse. The laptop is closed, and even when bluetooth is deactivated, the cursor moves.

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You forgot about a connected, wireless pointing device lying around somewhere under a stack of paper (mouse, Tragic Macpad, drawing tablet). Alternatively, stuff is lying on your Macbook's trackpad which you don't use. – Daniel Beck Jan 29 '12 at 13:50
ok, its a macbook pro, but it is closed (external monitor) i use the magic mouse – Fincha Jan 29 '12 at 14:50
@DanielBeck i have only my mouse, and even if I deactivate bluetouth it moves anyway – Fincha Jan 29 '12 at 14:56
@slhck done, yes it is like a magic :) – Fincha Jan 29 '12 at 15:23
Which OS are you using? – Bibhas Jan 29 '12 at 16:32
up vote 1 down vote accepted

I stumbled upon a thread in Apple Snow Leopard discussion forum. a bit old thread, but the problem is same. And it seems a lot of people have been facing the same problem. more than 120+ comments and yet no one found a good solution. They have tried various solutions like replacing the mouse with wired one, updating the browser(!) and someone even related it to more than one monitor being connected. But only those who ended up replacing the trackpad, seemed to have gotten rid of it. and it also makes sense I think. If no mouse is connected, bluetooth is turned off, and yet the pointer is moving, then it has to be some problem with the trackpad. You're welcome to wait for any further solutions, replacing the trackpad can be the last resort.

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If you have a touch screen, turn it off. I noticed the ripple effect of the cursor that should only happen when you touch the screen, not when using the touch pad or mouse. Fixed the problem right away. After a week I turned the touch screen back on, calibrated it and it was fine again. Appears you need to do that about every eight weeks.

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Touchscreen on a Mac? – Canadian Luke Jul 28 '12 at 11:14

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