Has anyone had a problem with their iMac G5 20" having screen flicker. It comes and goes but is very noticeable. I can usually alleviate it if I dim the screen or bighten the display. It goes away immediately if these settings are changed. It does not even happen very often but it worries me. I'll have to mark my calendar before the Applecare is up. I can't find any information on anyone with similar problems. Thanks.