Powerbook freeze issue with video (help please)

I've had some difficulty with my Powerbook G4 freezing up while surfing the web. It happens usually when on a website with video, i.e., Youtube, etc. Also, occurs when watching downloaded programs on ITunes.
I ran the hardware test (everything came up clean), I ran the Disk Utility (everything came up clean), and I reinstalled my software bundle. Yet, I still encounter this problem with some frequency.
Just some background: I bought my Powerbook August 2005, I run Mac OS X 10.4.8. It has 1.5 GHz processor and 1GB DDR SDRAM.
Any assistance that you could provide would be greatly appreciated. Thanks.
Powerbook G4   Mac OS X (10.4.8)  

Welcome to the Apple discussions.
When you look at about this mac (click blue apple, about this mac), does it show 1GB of memory?
How much free disk space do you have? You want to keep approximately 10% of it unused, for systems usage.
If you bring up your Activity Monitor, on your hard drive in applications/utilities, under system memory, what does it say for page ins/outs? If out's are 10% or greater of ins, then you have a memory constraint for the programs you run. The counts reset when you reboot, so the size of the ins/outs isn't important, rather the relationship is.
Have you looked at your activity monitor when these symptoms come up, to see if anything is causing your CPU to go to 100% usage?
If it were me, considering what you've already done, and disk space and memory considerations were OK, I'd take these additional steps. If you don't have it already, download OnyX from http://www.titanium.free.fr/pgs/english.html
1) Under Unix Utilities, choose the plutil tab and run it for all accounts. This ensures your preference files aren't corrupt.
2) Run all cleaning tasks. Note the next reboot may take slightly longer than normal.
3) Run all maintenance tasks, including complete optimization.
Now if that doesn't fix it, I'd ask if you've noticed this problem since installing 10.4.8, and if so, did you install 10.4.8 via software update? If yes, reinstall using the combo update from http://www.apple.com/support/downloads/macosx1048comboupdateppc.html . Sometimes the software update function doesn't update everything correctly, creating odd problems.

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