Running OS X 10.5.8 on a Macbook Pro that's roughly 2 years old (maybe a little more). About a week ago I noticed that I was unable to copy/paste/undo/cut. Thought it was a total command key failure at first but other shortcut functionality is intact (cmd+t/cmd+w etc). So I've isolated the problem to the left cmd key and the bottom row of my keyboard. Separately they work just fine, but they refuse to work together. Any thoughts?