My screen goes to black when i render and a hear a click from my g5

am posting here because problem occurs when using FCP.
g5 problems again, i fear.
curious if anyone else has had this problem...
when i start to render, my screen goes to black and i hear a clicking sound from my g5. if i hit a key on the keyboard, the screen comes back, the render starts up again, and then the screen goes to black again...another click.
ran hardware test...it failed the logic board test...but it failed the logic board test a month ago and when i took it to apple; they said it was bad ram. i replaced the ram and it seemed to be ok until now.
so i repaired permissions using Onyx and then the machine wouldn't restart. pulled all non-apple ram.
reset pmu, finally pulled plug and waited half an hour. tried to re-boot, power light on g5 came on and then went off. wouldn't come back on again.
pulled plug again, called apple.
while waiting for apple to answer...40 minutes...put plug back in and tried to pwr up. it finally restarted, but the same rendering issue.
apple said sounds like logic board problems and is sending someone out early next week...thank god for applecare.
so.....anyone else every have this issue?
thanks
carl

I've dealt with several G5 issues, never heard of this one. Cannot imagine what the logic board could have to do with this since there's nothing particularly unusual about rendering, nothing that is different from anything else the CPU is asked to do.
Please return and close the thread if o get it resolved with Apple's hlep.
bogiesan

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