Imac 2009 Intel Processor - Wired Mouse Question

Question

In a nutshell, since I have purchased my imac my wired mac mouse has been acting strangely
where my desktop screen suddenly fills up with expose type screens.
eg i go into preferences mouse settings then suddenly i get a pinkish background and other
applications open up suddenly and i am toggling between the two. the apple csrs told me to
replace the mouse (took it to the apple store) it was swapped and turn off expose under the
mouse settings.
everything went well -- about two months later (recently) the same issue started again,
I turned off expose (bottom option) and everything went well, until yesterday when my
tracker ball decided to only scroll up. I tried every setting 360 degrees etc and still the
mouse track ball only scrolls up.
* i have, cleaned my user accounts etc with onyx. I have run the daily, weekly, monthly
scripts, I have repaired permissions and im still running into this situation where the tracker ball
only scrolls up. I have also cleaned the mouse per apple specs.
If i didnt know better, Id say a mouse driver was corrupt or the changes to the mouse arent going
resident.
this morning I put in a wireless and wired windows mouse and everything is fine does anyone have
any idea of what is really occuring.... I am runnings only osx I am not doing dual boots

Answer 1

Please read this whole message before doing anything.
This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
The purpose of the test is to determine whether the problem is caused by third-party software that loads automatically at startup or login, by a peripheral device, by a font conflict, or by corruption of the file system or of certain system caches.
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.
Note: If FileVault is enabled, or if a firmware password is set, or if the startup volume is a Fusion Drive or a software RAID, you can’t do this. Ask for further instructions.
Safe mode is much slower to start up and run than normal, with limited graphics performance, and some things won’t work at all, including sound output and Wi-Fi on certain models. The next normal startup may also be somewhat slow.
The login screen appears even if you usually login automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
Test while in safe mode. Same problem?
After testing, restart as usual (not in safe mode) and verify that you still have the problem. Post the results of the test.