I found my Powerbook (2.2 GHz, OS 10.4.11) frozen this morning with a "you will need to turn off your laptop by holding down the power button" message which is in 3-4 languages on the monitor. I'd never seen this before so did what it said and it rebooted fine EXCEPT for all these green "fuzz-like" pixels all over my monitor. At that point, I rebooted again and they remained until I had used my browser for a while and it started to clear up but seems to come and go. I had just updated the OS yesterday to the current security but have no idea if that might have anything to do with it. Searching here didn't turn up anything I could find so wanted to know if anyone had experienced anything similar. Thanks.