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Mac OS X 10.5.8 running on 2 GHz PowerPC G5 iMac. Firewire no longer working (powers a firewire disk, but fails to mount). "About this Mac - Hardware - FireWire" displays "FireWire Bus: Warning: Unable to list FireWire devices". At boot, the Mac displays the blue screen for about 5 minutes before getting to the login screen. I suspect diagnostics are trying to communicate with the FireWire controller. Does anybody know how I could remove the FireWire startup routines from the boot sequence? Thanks.

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PS. I've done a clean instal of 10.5 and updated to 10.5.8. – Derry Jul 8 '10 at 14:19
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Does it do this even when your FireWire disk is disconnected? – jrc03c Jul 8 '10 at 14:59
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2 Answers

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You could try deleting (or renaming?) /System/Library/Extensions/IOFireWireFamily.kext, just make sure you back it up in a safe location first. I believe this driver interacts with FireWire as implied in its name.

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I'd say you're safer to chmod 000 the kext instead of removing it. – Graham May 15 '11 at 16:30
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Did you try booting your computer holding down command + option + o + f this boots into Open Firmware where you might be able to play with the boot settings

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