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If you don't run that you may end up, among other things, with your CPU fans running at 100% speed *all the time*. to find it, but that's an exercise for the reader. The other thing to note that is in theory if you start swapping CPU modules you're *supposed* to run a 'Thermal Calibration' program on them which is only officially available to licensed Apple servicemen. Of course, if it's broken anyway you don't have that much to lose. If you Google you'll find people that *have* apparently gotten away with it (largely people trying to fix leaking 2.5Ghz watercooled models), but just be advised that from an official standpoint the magic smoke lives under the heat sink, no deeper.

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(Supposedly the naked CPU dies are *very susceptible* to being cracked or otherwise damaged by applying uneven pressure by over/under torquing the retention bolts.) For the record the Powermac G5 Service manual also claims that you *will* damage the processor if you separate it from the heat sink. I was warned at the time by the Apple engineer who gave the system to me that that the CPU modules were exceedingly delicate and that removing the heat sinks was a good way to destroy them. On an advisory note, I had a 2.0 Ghz G5 Xserve for a while, which I understand uses basically the same CPU modules as the original G5 Desktops just with shorter heat sinks. Here's a Macintouch page discussing 'G5 Thermal Runaway'.

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And other times, it'll panic and show a screen full of text over the desktop wallpaper. Clock stops, mouse playing with it's beach-ball and so-forth - you get the picture. However, when my studio gets warmer, usually when the central heating kicks it's a whole new ball game! After starting the system, it'll completely finish booting, then on the odd occasion it'll just halt xx(.

Running heavy applications with test documents open in photoshop and première is fine, no problems at all! It'll be happy running all day all night! Even past a 72hour soak test!! : In a cool room, the entire system seem to boot up fine, be it a little slow, but that's because it's old :beige: everything will operate as expected. here's my dilemma, kinda odd behaviour if you ask me. Now as far as I'm aware this model doesn't have liquid cooled CPU's and thus those crashing ain't related to leakages, or are they?

Hiya all, some of you might of notice I recently acquired a very, very cheap PPC G5 2Ghz (DP), sub $150 system).