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Fix a misbehaving backlight on PowerBook G3 machines
Yes, this happened to my Wallstreet 300MHz when I installed OS X on a new 30GB IBM Travelstar hard drive after the original 8GB drive failed. One of the other symptoms I would see was the LCD would get really bright for a second before the backlight would go dim. There were a number of discussions about the problem on the Apple discussion boards a while back... maybe a year ago or so. There were some theories about hard drives, magnetic shielding, and the sleep sensor but I'm not sure if this was ever proven. It seemed to be reported more often for people who had upgraded thier hard drives (especially to the high capacity IBM Travelstars), but the problem wasn't necessarily limited to just these people.
I believe the same tip was suggested on the Apple discussion boards, too, since I've been running OS X on the PowerBook just fine for a long time now and I'm pretty sure I used it to get the backlight working properly again. Considering the OS 9 boot fix seems to work, if it does have to do with magnetic shielding, my theory is that OS 9 updates the PRAM with more tolerant threshold values for the LCD backlight / sleep sensor than OS X for the Wallstreets. Just a guess.
Fix a misbehaving backlight on PowerBook G3 machines
I have seen similair problems on my PowerBook 333 MHz. Both before and after I have upgraded the HD to an IBM 30 GIG travelstar.
Fix a misbehaving backlight on PowerBook G3 machines
First, the magnetic problem with certain IBM/Hitachi and Toshiba 2.5-in HDD is well documented, see the story at Upgrade a PowerBook G3, Part 1 and 2 ( http://homepage.mac.com/techedgeezine/cart_mac_pb1.html ). The fix is there too.
Backlight on PB G3 occasionally "supernovas"
I, too, occasionally boot my WallStreet G3 to find the display is at full strength. This is with OS 9.0.4. I don't have OS X installed on that machine. |
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