Submit Hint Search The Forums LinksStatsPollsHeadlinesRSS
14,000 hints and counting!


Click here to return to the 'Use wireless networking in safe boot mode' hint
The following comments are owned by whoever posted them. This site is not responsible for what they say.
Use wireless networking in safe boot mode
Authored by: johnsawyercjs on Jun 30, '08 03:21:18PM

Starting up in Safe Boot mode doesn't bypass the VRAM--the VRAM is a set of chips containing the Mac's video image, and if these chips were bypassed, you'd see nothing onscreen. Safe Boot doesn't let some extensions load, which activate specific extended functions of various chips, including some function controlled by circuitry that's damaged in your friend's Powerbook. The "troublemaking" extension may be one of the ATI extensions at System/Library/Extensions; when it loads, it encounters an unexpected hardware fault, which prevents OS X startup from proceeding. So, if you want to start up the Powerbook without turning off all the extensions that Safe Boot mode turns off, use a process of elimination to find the specific extension that's causing the trouble, and move it out of System/Library/Extensions--first drag one of them out, restart, see if the problem still exists, and if it does, restart in Safe Boot mode, drag the next ATI extension out, restart, etc. Once you've found the troublemaker, drag the other extensions you removed, back into System/Library/Extensions, then repair permissions (since moving extensions out of, then back into, this location will mess up their permissions).

When you remove some video-related extensions out of System/Library/Extensions, you may find a few video-related things don't work properly, if at all, like DVD Player--you may get an error like "A valid video device could not be found for playback. [-70017].". You can try VLC to play DVDs, but you may find most frames drop; same with Quicktime.



[ Reply to This | # ]
Use wireless networking in safe boot mode
Authored by: rwikoff on Jun 30, '08 08:46:31PM

To potentially speed this process up, startup in verbose mode by holding command-v on startup (or view the system logs after a failed start). You can often figure out what driver or hardware is causing the problem by noting the last item listed before the system fails.



[ Reply to This | # ]
Use wireless networking in safe boot mode
Authored by: wm on Jun 30, '08 11:29:54PM

Agreed, but note that all 12" PowerBooks had Nvidia GPUs, so you'd want to look at the GeForce and/or NVDA kexts.



[ Reply to This | # ]