Question regarding mouse issue with MAC MINI

I just got a MAC MINI (2.0 Ghz) this weekend and was using a Dell corded mouse which was working fine most of the afternoon yesterday and all of a sudden I couldn't get the icons on the dock to work, i would click on them and nothing would happen. Also the Finder box was open on the desktop but
the 3 buttons on the top left didn't have the + or - signs in them and wouldn't work at all..I tried rebooting and the command keys and nothing seemed to work..

I was getting so frustrated to the point of wanting to return the MINI when I decided to unplug the mouse and plug a Logitech wireless in it's place and lo and behold everything started working fine!

I was wondering if anyone else ever ran into this issue and why Apple's OS did not signal me that the mouse may have had an issue..

Not a good way to start off a relationship with this new MINI of mine....