A friend of mine macbook's mouse and keyboard stopped working last night for no reason, ideas? (They told me they didn't update and I think they are running leopard).
Loose connection could have finally worked all the way out. Spilt beer may have found its way to the end of the keyboard/trackpad ribbon. More details would be a help.
The same thing just happened to me. I went to the genius bar and something with whatever the keyboard, mouse and power button hook into was loose. If you friend goes in, they will fix it for her.