Software :: PowerBook Freezes With Both Safari And Firefox

I am having a constant laptop freeze issue with both Safari and Firefox. Laptop freeze occurs upon page load followed by most laptop functions being rendered unresponsive and a forced power reboot becomes necessary. In most cases, the cursor remains the only active item on the desktop and I am sometimes able to click on other open applications and bring them forward but that is the limit of their functionality. I can't force quit them via keyboard command either and the system clock is almost always frozen.

During the forced power reboot, the laptop does not seem to go through a permissions correction process (i.e., the long delay that you experience during gray apple screen start-up.) The reboot process is fairly quick and sometimes the only abnormality occasionally noted after reboot is that the desktop background has gone back to a default setting. Not sure if related but sometimes the iTunes library is damaged and has to be rebuilt if application was open prior to freeze. I've run complete diagnostics via Disk Utility, fsck, Applejack and TechTool Pro and no problems are noted.

OSX 10.4.11
1 Ghz PPC G4
1 MB L3 Cache
1 GB SDRAM