I have an IBOOK G4 running Tiger 10.4.11, which recently I upgraded from 768M to 1.25G RAM. It has an 80G HD which has about 50G free. I use it generally email and surfing the web. Recently, it started to run slow. Seems to be while surfing the internet. I use Safari. While surfing a while back it became very slow to respond on web pages, mostly got the "spinning color wheel", and then got pretty hot and the fan came on, first time I have heard the fan since I have had it. After researching, I downloaded Onyx maintenance program. After doing a thorough maintenance using Onyx, everything seems to be back to normal. Well, a few days later, after using laptop for quite a while roughly 1 1/2 hours, started to run slow while surfing again. Slow to respond, spinning wheel again, but the mouse (bluetooth) movement is never affected. Any ideas?