Has anyone else experienced this problem? My Rev. A iMac G5 has always been very quiet, but since I updated to 10.4.6 the noise from the fans is horrendous when running Classic. I just noticed this tonight as I only have one OS9 app and I very seldom use it but sometimes there is no alternative. It's not a heat issue as iStat nano shows 127F for CPU and 125F for hard drive and it definitely didn't do it before the upgrade. I suppose there's no fix for this and I'll just have to grin and bear it for another 6 hours or so til I'm finished this job?