I've seen two >1Ghz G4s basically die of heat exhaustion you may just be seeing the slow death of your hardware by heat. That era of PowerPC PowerBooks ran pretty hot after breaking the GHz barrier. Did you see what the System Profiler has to say about the battery? (see rwpritchett's instructions above.) Besides, this kind of problem almost always has to do with the battery. Since you're down to just one hour of use, it sounds like getting a new battery isn't going to hurt anyway. Could that point to a failing motherboard issue which also explains the battery problem? There is another issue with the machine in that the built-in Airport has failed so I use a PCMCIA card. The present one can last an hour without mains support. I wonder whether a replacement battery would help but don't wish to buy one just on the possibility. The battery seems to charge well and seems healthy in the hardware checks but sometimes the system fails to start unless I remove the battery, start up on main power and leave the battery out until the next restart, when everything works normally. Now this thread seems solved, perhaps I could add a question about my 2006 G4 Powerbook 15". Any help would be appreciated and I have already tried resetting the SMC and PRAM as well just so those are both ruled out. Just want to confirm this if it's the magsafe that means I'll be stuck probably taking it to a local mac reseller and getting new one but I'd hope it's the battery as batteries on ebay are $51 CDN to replace my A1175 battery i have. I'm thinking that it's time for this one to get a new battery. The magsafe light blinks and the icon alternates between showing the percentage and (not charging) showing. Since then highest I've seen it was 89% and now I've tried recalibrating and such and have seen it charge to 86% and stop and now just today 79% and stop. My issue is that the battery will only charge to max 90% or that's what it was when I picked it up from the seller a few days ago. Have a new to me macbook pro one of the late 2006 models with a 2.16Ghz core 2 duo 2GB DDR2 upgraded 500GB HD all that jazz currently running Snow leopard 10.6.6.
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