IMAC 27 - attached a second monitor - mouse tracking problem

After attaching a 19 inch lcd via the mini display port and a dvi adapter my mouse tracking has gone bad, not just from one screen to the other even just on the main screen if you move the mouse around it jumps several inches and is very inaccurate. problem goes away when the second mointor is unpluged.
Can anyone help?
Stephen

I'll add to the chorus: I have the 27" iMac, and I get the same mouse jumpiness when I connect my 24" Acer P244W display via the Mini DisplayPort-DVI adapter. Oddly enough, the mouse jumpiness is more pronounced when I use my old wired MS Intellimouse Optical than when I use the included Magic Mouse. I've confirmed with another Mac (and with this Mac minus the second display) that the wired mouse is functioning normally.
Basically, given slow, constant mouse movement, the cursor will hiccough for about a tenth of a second once every 1.0 seconds, like clockwork. Given more normal use, the cursor will continue to hiccough every second and will also occasionally jump to a completely unrelated location on the screen. (The wired mouse was the worse off here, jumping unpredictably several times a minute.)
I've unplugged the secondary display for now, but I kinda sorta really need it for Flash and video work. Apple, help!

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Okay. I went back and found an old trick that never worked for me before but now it does. You need to edit the user/library/preferences/.globalpreferences.plist. This file is invisible. What I did was open it with SNAX (it can show invisible files) by dragging the pref file onto TextEdit's Dock icon. You could also use TinkerTool to make the file visible or perhaps do the whole thing in the Terminal.
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Cheers

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IMAC 27 - attached a second monitor - mouse tracking problem

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