iMac not followed to the top of wired mouse

Hi all

I have an iMac with OS X 10.9.5 two years.  I have a wired mouse, not the bluetooth mouse. For some reason I can't find out, using the little grey ball allows me to scroll through the pages, but not to the top. So I have to go on the side of the window and back grey box. It's a drag.
Maybe I changed the settings to my wired mouse, and that could be the cause of the problem.   After changing all the settings in different ways, I still can't fix.  I cleaned up the grey ball (head down, rub it around on clean paper) and clean grime the grip of the track.  Here are the current settings.

Can someone tell me what I should try next?  I would really appreciate it.  Thank you!

Try resetting the SMC, it may take 2 or 3 attempts. Please follow the instructions of iMac SMC and the PRAM reset

Tags: Mac

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