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thanks. I am pretty sure the ROM is up-to-date, but I will double-check.

I have a PowerMac G5 1.6 GHz. One of the early model machines, a couple of years old. Its fans are very loud. I have searched all over for answers, and tried most tricks. In particular, I have reset the SMU, and even changed the Processor Performance pop-up menu in the Energy Saver control panel...