G4 Powerbook login loses video

B

bnewland

Registered
This issue is killing me!!

If I login to my pb, I can see the bar at the top of the screen, but before the dock can be seen, the screen goes black. The pb continues to run, and load, and the network card continues to pass traffic (lights on my buffalotech card still blink), but video stays black. If I connect a external monitor, it sees the same black screen.

I can login to the pb in safe mode, and video is fine, and I can operate the pb normally. From reading, I think it has to do with the kernel extensions loading, but am not proficient enough in the boot sequence to troubleshoot any further.

Any help is appreciated.
 
I noticed something similar with another coworker who had their screen go black but they could see the mouse and the system seemed to be working fine, except the screen was black.

Hit the F7 key on your PowerBook. When I did this on the coworker's PowerBook, I got the screen back. See if this works for you.
 
Have you tried zapping the PRAM? Hold down Command-Option-P-R right after the Macintosh startup chime. Hold it down for about 3-4 chimes and then let go so it can boot normally. Hopefully this will do it.
 
I have tried it before, without success, and tried it again 4 chimes worth. No go.
For grins, I installed (on a new drive) a fresh install of 10.4, and downloaded all the updates to 10.4.7 and everything else that was in the software update queue. I was able to get the updates all done, but after rebooting, it began happening again. Could there be a change in 10.4.7 that is causing this?
 
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