Greetings, Yesterday, our imac display began to look odd - it looks like there's a fine white mesh over the dashboard, and over the drop-down menus in Safari and Firefox. When we're typing in a field, the cursor has a small square made of approx. 8 lines that follows it around, both online and in documents. Everything works fine, it's just odd-looking. We haven't downloaded or upgraded anything. We tried restarting, and shutting down, thinking things might reset themselves but alas... And now that I'm thinking about it, our little apple-key began working erratically. Has anyone experienced this?