G5 Dual 2.5GHz freezes with a very high pitch sound

Hi
My G5 Dual 2.5GHz freezes with a very high pitch sound from inside the comp. It happens occasionally after a few days of everything running smoothly. Someone can help ?
PowerMac G5 Dual 2.5 GHz   Mac OS X (10.4.9)  

Hi Phil Brayshaw-
What does the little white power light do? This should be helpful: About the Power Mac G5 (Late 2005) diagnostic LEDs
Although it sounds to me like you have tried most of the troubleshooting steps, this document is a good overall reference to address this particular problem: Power Mac G5: What to do if you see black, white, or no video at start up
Have you tried another monitor and/or double-checked your cable and its connections? If everything else is working as expected that would certainly be a major suspect.
Luck-
-DP

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