Then I squinted at the laptop screen and saw that a second Display pane was showing there, which I dragged over to the external. I have an external monitor so I could soldier on with only one screen -), but I was fearing the worst for my poor G4, like the backlight was dead, maybe.Īnyhoo, I opened the Display preferences and started playing around with the screen that was presented on the ext. (95% because if I squinted hard I could see things on the laptop screen). In my case, the laptop worked fine but the screen was 95% dark from startup and rebooting didn't correct this, as it has in the past. (the parts are under $40, it's almlost pure labor)Ĭame across this great thread after experiencing the same blackscreen problem on my PB G4 1Ghz running 10.4.11.
MACBOOK G4 BLACK PORTABLE
If you take it into a local apple reseller with a portable certified tech, you'll be looking around $250 or so. If you have it sent in for depot repair, you will be looking to spend at least $400 as this would be considered a tier 1 repair. I'd advise checking with apple on this before making any decisions. I'm going to assume you are no longer under warranty. It'll save time, aggrivation and risk of damaging anything when working on the computer. You may be better off having your local Apple reseller/service dept handle this repair. I'm a portable tech who has worked on just about every portable that Apple has ever made (save for the kanga g3) and I would say that the 12" PowerBook G4 is a machine that even the most seasoned of techs are wary of working on. If there is video - you've got a bum inverter cable.Īnother thing to bear in mind. If there is no video on your lcd when this occurs - you've got a bad reed switch. I would venture a guess that your reed switch is bad as the computer could be thinking that it's in clamshell mode and turning off the display. On the older iBook G4's, the reed switch and inverter cable were one piece - when it failed (which was a when not an if) the computer would do weird things - similar symptoms to what you are describing. On the 12" PowerBook G4's and final rev of the iBook G4, the reed switch and inverter cable are two separate parts. If it still has warranty, and it continues to do it, call apple and let them know, it might be a hardware problem (most likely not, Apple just would rather replace mine that have me send it in for the 15th time)Ī potential cause for your problem is a bad reed switch and/or inverter cable. It might be that the power manager did not fully reset itself if the LCD Backlight goes off again in the future. If you have time, and can wait, let the system sit for 24hrs w/o power whatsoever. I would say if it looks like it's still doing, what you do, is unplug the machine, pull the battery (save your data first before shutdown!) and press the CUDA switch (probably under the keyboard if it has one or something) and reset it is fully. Sadly, i never found out what the solution was on my old iBook before I sent it in to get it replaced by my current G4 iBook (i had the 900Mhz G3, They gave me a 1.2Ghz iBook after my G3 went in 14x ) anyways, it sounds like the power manager is having problems. The power manager controls sleep as well as the brightness of the display. So far it's not doing it but I am worried that it's a backlight issue or something else? I have heard of random sleeping problems with the powerbooks, but mine doesn't actually go to sleep. I closed the lid and then it went to sleep and then I opened it and switched the battery settings to the above, and it was fine. When I unplugged it it did the same thing. That worked as long as its plugged into the AC adapter. I switched the power settings to "never" for sleep and like 5 minutes for display sleep. I can still see that the screen is on, but the display is dark. What I've been doing is putting the computer to sleep by closing the lid, letting it rest for a few seconds and turning it back on by opening it. I have a 12" Powerbook G4 1.5" and lately the screen randomly turns itself off, the whole thing goes black, like it was asleep or off, but the computer keeps running just fine.
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