Erratic mouse behavior

I have a MacPro running Leopard 10.5.8. Yesterday the mouse began behaving erratically. It seems to be perpetually trying to scroll down. It also won't allow me to select anything. The keyboard appears to be unaffected. I have tried 2 other manufacturers mouses and the same problem persists. I can only conclude it is some sort of software issue. The problem does not exist when I'm in Bootcamp running Windows XP. Anybody have any ideas?

Well, I tried that and it didn't work. I also uninstalled the Intellipoint (Microsoft) software that was controlling the mouse and that didn't work either. I've now got my wired Apple mouse attached to my Apple aluminum keyboard which is attached to my MacPro. Still no luck. It continues to behave very strangely. Any other ideas out there?

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    Hello , Welcome to the HP Forums, I hope you enjoy your experience! To help you get the most out of the HP Forums I would like to direct your attention to the HP Forums Guide First Time Here? Learn How to Post and More. I have read your post on how ghost circles and erratic mouse behaviour appear on the screen of your desktop computer, and I would be happy to assist you in this matter! To correct this issue, I recommend following the steps in this document on HP All-in-One PCs - Troubleshooting Touch Screen Issues (Windows 8). This should help return the functionality to your touch screen. I also suggest following the steps in this document on HP PCs - Wireless Keyboard and Mouse Troubleshooting, which should help correct the intermittent cursor behaviour. If the circles still appear, and the mouse still behaves erratically, I recommend returning your system back to a previous restore point before the issue occurred. This can be done by following the steps in this document on Using Microsoft System Restore (Windows 8).
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    Message was edited by: 46r

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    Click on the link below to see more details and screenshots. 
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