Spontaneous shut down

I am not sure which forum to post this in, since I don't know if it is a hardware or software issue, not whether it is only with iBook, etc.
My wife's ibook with 10.4.2 had a series of shutdowns, for no apparent reason the computer would just turn off. After leaving it at the apple store for a few days, they gave her a new computer, unable to find the cause. I know a few other ibook owners who have had this occur, some with 10.3?? (I believe, it was a non-Tiger OS) and some with 10.4.2.
Is this a known issue.
I was using one of the computers when this occurred and there was plenty of battery power. I was not moving around (thus no chance for static electric shock).
Just wondering if anyone has heard of this.
Thanks!

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See:
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My Power iMAc G5 10.4.11 is spontaneously shutting down when I close all open apps.
This has never happened before and energy saver shutdown does not appear active when checked.
I know this is an old iMac and I will be replacing it later this year, but it works fine otherwise and does everything that I need it to.
Any advice?
Many thanks.

Have you reset the SMU?

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Help!
I've searched. I've read. I can't find the answer!
After I updated my firmware several weeks ago (to SMC 1.3f4), I've had problems with spontaneous shut-down of the computer, and a frustrating application shut-down issue (Safari, Mail, Word--you name it!).
I tried to find the other firmward update from last summer, which I read about in several posts from July/August, but the link is dead (Mac Mini Firmware update 1.0.1).
Coincidentally, after an office break-in two weeks ago, I FileVaulted my computer. I thought my problem must have to do with that, but all the posts I can find here are about this firmware thing.
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Hi,
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Hi,
So I was using my macbook pro today (running OSX 10.8.2, bought spring 2010) and the screen froze. The screen image changed- it looked like someone ran thier fingers through a wet painting. I force restarted the computer with the power button and about 10 minutes later the computer shut down on it's own with no warning (I was typing and the screen went black.) I attempted to start the computer again by pressing the power button. The computer eventually turned on when I held the power button down. A black grey screen appeared and the computer made a plusing, low toned beeping noise. Since I was in a class, I was not able to determine the frequencey of the beeps (just trying to get it to turn off). I held down the power button and it eventually stopped after about 3 minutes.
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For the past few days, my MacBook has been shutting down without warning while plugged in and fully charged. I initially thought it was due to an old battery, since the battery life had been unpredictable enough to cause sudden shut downs at around ~15% battery life in the past, so I had the battery replaced today. However, it has not fixed the sudden shut down problem. I've reset the NVRAM and SMC, since I read it could help the problem, but neither has helped.
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Laptop information:
Model Identifier:          MacBookPro5,5
Processor Name:          Intel Core 2 Duo
Processor Speed:          2.53 GHz
Number Of Processors:          1
Total Number Of Cores:          2
L2 Cache:          3 MB
Memory:          4 GB
Bus Speed:          1.07 GHz
Boot ROM Version:          MBP55.00AC.B03
SMC Version (system):          1.47f2
Charge Information:
Charge remaining (mAh):          4792
Fully charged:          No
Charging:          No
Full charge capacity (mAh):          5854
Health Information:
Cycle count:          0
Condition:          Normal

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My suspicions are that your battery is questionable or there is a bad connection internally. Go to SYSTEM PROFILER>HARDWARE>POWER>BATTERY INFORMATION and post this information;
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Hello jadevore1
Wow! What a irritating problem to have the device reset on its own. Let's investigate this together.
When the device resets, is it using a particular application? Are any applications open when it resets? Is the battery loose or swollen? Please remove the battery for 15 seconds then reinsert and retest.
If you still are having the issue. Please back up the device and perform a hard reset. Here's a link to the hard reset: http://support.verizonwireless.com/clc/devices/knowledge_base.html?id=40853
Please let me know if this helps.
Thank you
JoeL_VZW
Please follow us on twitter @vzwsupport

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Spontaneous shut down

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