I was using my MacBook this evening and navigated to a webpage that wouldn't load (perhaps due to excessive load) when my screen turned off and refused to turn back on. The white "sleep" light remained constant. I shut the screen and the light started to blink after the optical drive made it's noise and then I opened the screen again. The display turned on for a few seconds turning back off and the light on the front reverted to it's constant state. I repeated pressing keys, the mouse and closing and opening the screen a few times before holding the power button down and forcing it to shut down. It's working fine now. I am wondering what caused this sudden behaviour though and how to best stop it from happening again, if I was working on something that needed to be saved, I'd be buggered. Perhaps it's an issue Apple needs to service, but how do I reproduce the effect then ? At the time I had a few applications open: Mail Safari Mercury Messenger iTunes (not playing) Last.fm helper app (but no songs were currently playing) I was thinking it could possibly be related to the Last.fm app, but why would it turn my screen off and then cause it to continue to not respond/turn off ? Should I be looking in the Console for a log before shutting down tonight, would that reveal something ? Any help much appreciated.