IMac G5 freezes or locks up in Screen Save Mode

After about 5 minutes in the screen saver mode my iMac G5 locks up and will not go to the password menu. The fans turn on the only way to get out of this is to power down. I have tried to force quit but the keyboard locks out too. I am running the Apple screen saver the beach scene one. The only thing I have changed is when the screen saver comes on. I have 95 gigs open on my hard drive too.
Any thoughts? Thanks

Hopefully all that you need is to perform disk repair (not permissions) using the Disk Utility version located on your grey-label Install Disc 1, once you have booted from that disc.
Insert the disc into your optical drive and immediately choose "Restart" from your blue apple menu. Upon hearing the startup chord, immediately press and hold the "c" key until you see the progress indicator. First install screen is language selection, second install screen at the top of the display you see pull-downs, one of which is Utilities. Select Disk Utility, from the drives listed on the left, choose the entire internal hard drive which should be the first listed. On the right verify you're on First Aid panel, then click "Repair Disk" button and allow to run until completion. Re-run if necessary until it reports "No repairs necessary"
Quit Disk Utility, Quit installation sequence, restart to usual startup disk.
Please note that your HDD is now over 80 percent full, and many believe that beyond that point you might start to see the iMac's operating efficiency steadily deteriorate. [click the iMac G5 link, search "swap space" or "defrag"] You might want to consider adding an external firewire/usb hard drive for additional storage, but certainly get something for backing up. There is probably a little on your current HDD that you would rather not lose:) This is the time to protect yourself.

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IMac G5 freezes or locks up in Screen Save Mode

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