Mr. Beavis,
I am a novice and don't understand the half of what I need to know to be doing half the things I do. I received an iMac Intel by mistake, used it in the mean time while awaiting the G5 the I wanted. In getting the Intel ready to pack and ship back I wanted to erase everything with secure erase and reinstall the OS X shipped with the machine. I selected everything on the the hard drive, I mean everything and put in the trash, selected secure trash and troubles began to make this story short and relevent to your case I encountered your mouse problem. I started digging throughD. Progue' Mac OSX Tiger ed. the Missing Manuals I found you can navigate menus and window panes using the tab key to rotate through what ever you have t select from, radio buttons, the works. when you've rotated through to your selection you can choose it by taping the space bar. I've run through disk utilities various utilities, erased, first aid, partician, sometimes using the mouse on a drop down menu from the menue bar. I then was able to navigate through the various selections of the install panes up to the point of the select drive pane. Iwas eventually able to select the drive but un able to instal getting a message to the effect "can't instal.OSX needs 15.5 Gb, there's not enough space" this message came up despite the fact that disk first aid said that the disk was fine, 149 Gb available. also got the same message while in Terminal doing the fsck ( I think that's how you spell it, I'd half to dig back in the book to be sure) routine reporting back that everything look good.
so, for what good it might do you there you have it. I'd be curious as to what everyone can figure out is the problem and how to deal with it.... or not. good luck.
NC Innkeeper