On Thursday, May 8, 2003, at 11:32 AM, Jeremy Derr wrote:
actually..... the CUDA reset (nowadays called a PMU reset), if done too much, could result in a dead logic board. The CUDA and PMU chips are flashable EEPROMs - meaning they're chips that can be erased and rewritten. The problem is that, like all EEPROMs, they can only be erase so many times (I have no idea how many, but it's something more than 100 and less than 1000). If you exceed this limit and hit the reset again, the chip gets erased and may not be rewritten... and it MUST be rewritten in order to boot.
Apple only suggests hitting the PMU when you're having problems and a few other specific situations - things like replacing the processor, after replacing the logic board, etc. Some techs will suggest doing so when you install new RAM, but I only do so when installing new PCI cards (this includes Airport cards - which, like all cardbus and cardbus-like devices, use a subset of the PCI standard).
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