Thank you for your reply. I already tried resetting the parameter RAM. At least a dozen times. It made no difference. That was the first thing I tried. I too, thought it was a software issue. But I couldn't find any software to change. It happened on multiple OS 10 versions as well as OS 9.
Eventually I gave up and purchased some replacement inverters. So far, so good. But I swear the screen brightness, even at the highest setting, is less bright than it was before. Regardless, the backlight seems to work. I'm still concerned it may be a software issue. I also tried resetting the power manager (PMU) on multiple occasions and it didn't make any difference. I'm hoping the new inverter fixes it. But it still seems like such an odd manifestation. On Aug 15, 7:57 am, Bruce Johnson <[email protected]> wrote: > On Aug 12, 2011, at 5:58 PM, George Skrong wrote: > > > ne other thing: If I boot the machine into system picker, the > > backlight comes on and stays on. Same thing if I boot it into Open > > Firmware. The problems seem to occur the second the OS boots up, > > regardless of which OS version it is. > > > The machine has become unusable at this point. I thought at first it > > was a software problem but I'm not so sure now. > > if it works AT ALL, it's a software issue, or rather it's likely a firmware > issue, something stored in the parameter ram. > > Try resetting the PRAM: boot while holding the command, option, p and r keys > down. It will do the boot chime, then do it again. Tradition holds that > letting it 'bong' three times fixes what ails it. > > This will reset everything, including the date, but it should fix the errant > sleep issues. > > -- > Bruce Johnson > > "Wherever you go, there you are" B. Banzai, PhD -- You received this message because you are a member of G-Books, a group for those using G3 iBooks and PowerBooks (we run a separate list for G4 'Books). The list FAQ is at http://lowendmac.com/lists/g-books.html and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to [email protected] To leave this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/g-books Support for older Macs: http://lowendmac.com/services/
