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Possibly recover from a dual CPU failure on a Mac Pro
Authored by: johnsawyercjs on Aug 27, '08 04:08:17AM

Permanently damaged? Absolute nonsense. Where did you hear this? I've been fixing Macs since 1985, and removed batteries from thousands of them, and run many without batteries, and none have ever been damaged as a result. When the battery dies, it's the same as running without a battery, and the Mac doesn't die under that condition either. It's not cool to start or perpetuate a completely untrue rumor which makes people leery of trying a troubleshooting method that often works, when PRAM/NVRAM is scrambled. If you've had Mac die after you removed its battery and powered it up, it had other problems, and/or you zapped the logic board with static electricity buildup on your body, etc.

To reset a Mac's PRAM/NVRAM/Open Firmware/PMU/SMU etc. chip(s), I would first try other methods since they're easier, for most people, than removing and reinstalling the internal battery. I'd reset them from the keyboard first, following the Mac model's particular power manager reset process, if just unplugging and plugging in the AC power cord didn't help (and in fact just unplugging the AC cord is the method for resetting some Mac models); if those methods didn't help, then I'd press the logic board's reset button. As far as a "CMOS" battery's health goes (it should be called a lithium battery, referring to the battery type, not to the type of chip it's powering, since so many other chips in a computer are also CMOS, not just the clock/calendar/PRAM/NVRAM chips), you need to measure its current-delivering capacity, not its voltage, since a bad battery may still measure full or nearly full voltage of 3.6 volts. If the battery's current-delivering capacity is at or near zero, it should be replaced, or else reinstalling it may just make the Mac act up again.



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Possibly recover from a dual CPU failure on a Mac Pro
Authored by: ghay on Aug 29, '08 12:14:40PM

Did you not ever come across the LC475?

That was post 1985, but try removing the battery or letting one die - the Mac will not boot without it. Common problem at the time....



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Possibly recover from a dual CPU failure on a Mac Pro
Authored by: osxpounder on Sep 02, '08 09:58:04AM

Still, that's not exactly permanent damage, one must admit.



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