Mouse pointer jumps to corners of screen

I am using a Mighty Mouse (wired) and have had problems with my mouse pointer jumping to the four corners of the screen. I then have to move the mouse around and find what corner it is in, and bring it back to where it was. It happens very often, and is very distracting.
I have had the same problem with a Microsoft wireless mouse and a previous Mighty Mouse.
Any ideas as to how the stop the jumping would be greatly appreciated.
Snoopyknitter

The suggestion to follow the cord was evidently the correct one. I had my Mighty Mouse plugged into the usb port on the back of my Mac keyboard. When I realized this (I have had it set up this way since I got my G5) I plugged it into one of the usb ports on the back of the monitor. In several hours I haven't seen the pointer jump once.
I will leave it set up this way and watch, but I think this may have been the solution. To think it was such an easy solution and I have been putting up with this for several years!
Thanks Thomas Bryant.
Snoopyknitter

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sc0001

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Please read this whole message before doing anything.
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Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards, if applicable. Start up in safe mode and log in to the account with the problem. You must hold down the shift key twice: once when you turn on the computer, and again when you log in.
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Message was edited by: Helen A

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Mouse pointer jumps to corners of screen

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