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Logic board reset may repair non-functional FireWire
Authored by: lantzn on Dec 08, '03 03:14:03PM

This happened to me this morning on my dual 1GHz G4. I read in the AppleCare Sherlock menu about resetting the PRAM and NVRAM, tried that but nothing. Then I saw something about resetting the PMU button should you be having hardware issues. Since neither of my fw drives were mounting in either OS9 or OSX, I figured it was a hardware issue with the fw ports. I shut down, pulled the power cord, pulled the battery and checked it for 3.5 volts (check was good), reinstalled battery and waited 60 seconds, pushed the PMU button on the mother board with my finger and held it for 60 seconds. Rebooted and drives were back again. It's important to hold the PMU button down for awhile because the first time I tried this I only briefly pushed it and let go and drives did not appear. It did say DO NOT press the PMU button more then once during the process because it could cause major issues. I figured booting up completed the process and so I shut down and went through the process a second time holding the PMU longer the second time around.



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Logic board reset may repair non-functional FireWire
Authored by: timbloom on Dec 09, '03 02:23:11PM

Apple says to hold that button for "less than a second". Otherwise it will either drain your PRAM battery, or it will shorten the life of it dramatically.



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Logic board reset may repair non-functional FireWire
Authored by: gl@ on Jan 25, '04 09:54:27AM

Where is the PMU button ?



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