Repeating mouse freeze followed by blue screen then back to normal

Hi guys, if anyone can help with this, I'd really appreciate it... it's really driving me nuts! Every few minutes, my mouse freezes, the screen then goes totally blue for a 10-20 secs. The screen then goes back to normal for a second or two then back to a transparent blue screen (showing my desktop etc. behind it) for another 10-20 secs then back to normal after maybe one or two more flashes of blue screen. It's got so bad that I can't use the computer any more.
It's a G4 (2x1.25Ghz) with mirrored doors running 10.3.9 with 1GB of RAM
Thanks,
David.

There are so many things that there is no clear symptom or cause as to why the system is partially hung.
I would familiarize myself with the system, buy a book (or two) starting with "Mac OS X: The Missing Manual"
http://www.apple.com/macosx/resources/
About This Mac... more -> System Profile
will display memory condition, log files (system, panic, etc)
Depends on how much memory, what you are doing, whether you have a driver issue, or maybe a corrupt preference, font, directory.
Unlikely it was a parity error, but if it was a kernel panic, it would not leave it up to your imagination, it would be in clear black and white.
You could run your Apple Hardware Test; Disk Warrior (or just Apple's if you haven't yet bought DW).
Backup and boot from another drive to run repairs.
I would be more concerned over lack of a UPS and a power issue/outage or 'brownout.'

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Repeating mouse freeze followed by blue screen then back to normal

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