Why isn't a regular wireless logitech mouse able to click on things on the desktop on a PowerMac G5 2006 Mac OS X Leopard when it is able to move the curser around?
The settings need tweaking. Try the Logitech Control Center
software or something like Steer Mouse.
--> I couldn't download any programme due to the mouse not
working, so the issue was that the mouse needed replacement, i
bought a mighty mouse from apple with a wire, and that worked
:)