Need help fixing my computer freezing

[KGB]

Hey guys,

Last few days I have been having trouble with my computer freezing up.
There is nothing specific I'm doing when it freezes. It can happen in Safari, iTunes, Finder etc etc. I really don't know what triggers it.
When it freezes it doesn't give me the "spinning beachball", it just freezes up.
I can still move the cursor, but I can't click anything.
The only thing I can do is command+option+esc and then restart the finder.
That solves it for a while.
I have tried repairing permissions, used Onyx and Techtool pro, no results there.
Did a hardware test, but there were no problems found.
I'm figuring it's probably a software problem.
I already made a back up of my users, as a last resort I will do a full reinstall.
But if any of you might have any suggestions without having to do the reinstall,
I would be very happy.

specs
2 GHz powerPC G5 (2x)   Mac OS X (10.4.5)   2.5 GB DDR SDRAM


Thanks in advance

[Ethion]

Get Discwarrior, it might help.

[BFG]

In cases like this if i want to test a system without having to actually make any changes etc then the best thing to do is boot the computer up from a seperate HD or other clean system - run it for as long as possible and see if you get the same problems - if not then you've narrowed your problem down to your system, if the freezing continues... then i hate to say it but start looking at the hardware!

[KGB]

Hey guys thanks for the help.
I decided to reinstall OSX  Archive and Install.
All is well now
Move along 

[Ethion]

you should still get discwarrior