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same kind of problem here.
Authored by: johnsawyercjs on Feb 29, '04 05:25:31PM

Actually, it won't fry the logic board as such, but it can scramble the firmware chip which is on the logic board, and the Open Firmware settings, resulting in anything from weird video but a Mac that works otherwise, to a black screen and no boot. There are ways around this if this happens to you; mainly they involve removing the RAM and installing different RAM, which often gets the logic board running well enough to allow you to boot from an OS 9.1 - 9.2.2 hard drive and update the firmware, since when the logic board sees a new RAM configuration, it TEMPORARILY resets some of the scrambled settings as part of its process of storing the new RAM configuration, usually long enough to allow the Mac to boot and allow a firmware update; simply resetting Open Firmware sometimes does the trick, but replacing the RAM works more often. But again the effect is only temporary, so you need to quickly update the firmware once you get the Mac running, which will clear up any remaining messed-up video too. Sometimes you have to replace the RAM several times during this process, with different RAM each time, until you get OS 9 to boot and let you run the firmware updater. Works for me every time (I fix Macs for a living, so I've seen this many times).

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