Do Not Enter Sign
You know the signs you see when you're not supposed to do something or go somewhere in this area? The sign with the circle and line through it? Well, I got that sign on startup one day on my iBook G3. I'd never seen that one before so I started with assuming that my RAM stick needed to be re-seated. Did it and restarted. Same thing. Took it out. Restarted. Same thing. Next, I removed the Airport Card. Booted up normally. Replaced Airport Card. Booted up normally. Have any of you seen this symbol before? Was it just a coincidence?
Mac OS X (10.4.4)