So, I have had my iMac for a few years (late 09 model) and recently I have been getting an error the flashes on and then off the screen so quickly, I don't even have a chance to read what it says. So far I haven't experienced any serious problems or performance drop, but it's still a scary thing considering how much money I spent on this machine. Anyone else have this issue? It's literally up and gone in about, a tenth of a second. It honestly might not even be an error, I just can't read it and don't know what else it could be. Help?