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@StandardPractice
I was hoping someone who knows Macs might be able to help. I've UTFG (used the fucking google) but there is a hopelessly large amount of unfocussed information that it was very tricky to sift through effectively.
I have an iMac G5 (iSight), the last 20" model before they switched to Intel. It's worked reliably since I bought it a few years go until about two months ago when it just broke down. The main logic board was kaput. Luckily I was able to have it repaired free of charge by Apple on the very end of my extended Applecare warranty thing.
I've had it back now or a few weeks and it's working really well... except that the fan comes on and runs fast and loudly periodically. For the most part it runs as quietly as it should, but if I open a large CAD drawing (for instance) the fan gradually ramps up to full speed. When I close the file it gradually winds down and returns to normal.
In other words, when the computer is working harder the fan seems to run faster and louder. Can anyone shed any light on this for me? It really is intolerably noisy and 95% of my work is in using such drawing files.
Many thanks in advance for any guidance.