Tiger freezes frequently...

It seems like sometimes when I boot up my computer, it will bring me to the desktop with everything displayed, even the cursor, but it will be locked up occasionally, to where I can't even turn it off with the power button (I have to press reset). Everything is frozen, and I've tried getting responses from both the keyboard and mouse when it freezes, but I usually get nothing. I find that it freezes after a boot, after something copies, or after I plug a flash drive in. It's happened with Panther as well. Could it have something to do with the keyboard and mouse (they're old, I think from an Apple II, or at least that's what my computer says). I've installed updates, etc but still it freezes. Could it also be the hard drive and not the software (the hard drive is pretty old). I doubt it, though, because my experience is that the hard drive either quits and doesn't work at all or works perfectly. This is a fresh install with Tiger, and it did it with my newly installed Panther version as well.
Help!
Thanks.

Check to make sure that all 512mB is showing up in "About this mac" if it is less than 512 select "More info" to check which slots are under-reporting.
Also try running "Remember" from here:
http://www.kelleycomputing.net:16080/rember/
Select ALL / Infinite loops / Quit all applications / Quit Finder.

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I do have the similar problem, and no solution yet. After I've connected LaCie external hard-drive, Tiger freezes every time screensaver runs. Sometimes it happens at any point during the work without any reason. I can move the mouse just like you do (not when screensaver is on, though)
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Tiger freezes frequently...

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