My iMac came with Leopard, and for the most part I love it. However I've been having nothing but trouble with my mouse..should read mice because I've tried 3 different mice and I can't seem to figure out what the problem is, even after reinstalling. So my question is, is there anyway I can buy a copy of Tiger from Apple for this computer or am I stuck with Leopard? Mouse problem I'm having is no double clicks register, only some single clicks register, and I can't even switch tracks in iTunes anymore with my mouse. I've tried resetting the Pram and reinstalling Leopard, including swapping USB ports to no avail...If anyone knows how to fix this I'd be forever greatfull for your help.