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iMac shuts down for no reason

Message #1 - Posted 2007/10/10 - Evan Z

Hi all,

My iMac G5 (10.4.10) keeps on turning off for no reason. I'll walk away from the computer, come back an hour later, and it'll be shut down. It almost always happens when I'm not using it, for whatever that's worth.

About 2 years ago, the same computer would shut down every time it went to sleep. Apple replaced the power supply and that solved the problem.

This time, there doesn't seem to be any connection to sleep mode. I've left it asleep overnight, and it's still been on in the morning. On the other hand, I know it's shut down minutes after I walked away from it, when it was still awake.

I've run disk repair and the hardware test since this started happening, and both showed no problems.

Does anyone have any thoughts about what this might be? Is there anything on the computer that I can check for clues (logs or anything like that)?

Thanks for any help you can offer!
-ez

Message #2 - Posted 2007/10/10 - sbt

Previously, Evan Z wrote:

Hi all,

My iMac G5 (10.4.10) keeps on turning off for no reason. I'll walk away from the computer, come back an hour later, and it'll be shut down. It almost always happens when I'm not using it, for whatever that's worth.

About 2 years ago, the same computer would shut down every time it went to sleep. Apple replaced the power supply and that solved the problem.

This time, there doesn't seem to be any connection to sleep mode. I've left it asleep overnight, and it's still been on in the morning. On the other hand, I know it's shut down minutes after I walked away from it, when it was still awake.

I've run disk repair and the hardware test since this started happening, and both showed no problems.

Does anyone have any thoughts about what this might be? Is there anything on the computer that I can check for clues (logs or anything like that)?

Thanks for any help you can offer!
-ez

Gremlins? Is it a coincidence that the same thing started happening to my kid brother's G5 iMac the day before yesterday? Even though his is still under AppleCare, he couldn't afford to be without it for the few days, so he moved his Intel iMac purchase up a few weeks (was going to buy after Leopard came out), did the Migration Assistant thing, and took his in for service -- we should know the cause in a few days.

I had a similar problem with a Wintel box and a PowerMac G4 a few years back -- in both cases it turned out to be power cords/plugs that just weren't seating properly. That's now the first thing I check.

Spenser

Message #3 - Posted 2007/10/10 - Evan Z

sbt wrote:

Previously, Evan Z wrote:

Hi all,

My iMac G5 (10.4.10) keeps on turning off for no reason. I'll walk away from the computer, come back an hour later, and it'll be shut down. It almost always happens when I'm not using it, for whatever that's worth.

About 2 years ago, the same computer would shut down every time it went to sleep. Apple replaced the power supply and that solved the problem.

This time, there doesn't seem to be any connection to sleep mode. I've left it asleep overnight, and it's still been on in the morning. On the other hand, I know it's shut down minutes after I walked away from it, when it was still awake.

I've run disk repair and the hardware test since this started happening, and both showed no problems.

Does anyone have any thoughts about what this might be? Is there anything on the computer that I can check for clues (logs or anything like that)?

Thanks for any help you can offer!

Gremlins?

I was afraid of that. :( At first I thought it wasn't the computer but the electricity flickering in my apartment, but I'm pretty sure that isn't the case now.

Is it a coincidence that the same thing started happening to

my kid brother's G5 iMac the day before yesterday? Even though his is still under AppleCare, he couldn't afford to be without it for the few days, so he moved his Intel iMac purchase up a few weeks (was going to buy after Leopard came out), did the Migration Assistant thing, and took his in for service -- we should know the cause in a few days.

Strange coincidence. If you can post what the results are, that would be great. Sadly, my iMac is about one week out of AppleCare. I just moved, and I really don't want to splurge for a new computer.

I had a similar problem with a Wintel box and a PowerMac G4 a few years back -- in both cases it turned out to be power cords/plugs that just weren't seating properly. That's now the first thing I check.

I don't think that's the problem in this case, but I'll double-check. Thanks for the help!

ez

Message #4 - Posted 2007/10/10 - matt neuburg

Evan Z wrote:

Hi all,

My iMac G5 (10.4.10) keeps on turning off for no reason. I'll walk away from the computer, come back an hour later, and it'll be shut down. It almost always happens when I'm not using it, for whatever that's worth.

About 2 years ago, the same computer would shut down every time it went to sleep. Apple replaced the power supply and that solved the problem.

It still might need a power supply. This generation of machine is probably embraced in the ongoing free repair program:

http://docs.info.apple.com/article.html?artnum=302181

m.

matt neuburg, phd = matt@tidbits.com, http://www.tidbits.com/matt/ Tiger - http://www.takecontrolbooks.com/tiger-customizing.html AppleScript - http://www.amazon.com/gp/product/0596102119 Read TidBITS! It's free and smart. http://www.tidbits.com

Message #5 - Posted 2007/10/10 - Evan Z

matt neuburg wrote:

Evan Z wrote:

Hi all,

My iMac G5 (10.4.10) keeps on turning off for no reason. I'll walk away from the computer, come back an hour later, and it'll be shut down. It almost always happens when I'm not using it, for whatever that's worth.

About 2 years ago, the same computer would shut down every time it went to sleep. Apple replaced the power supply and that solved the problem.

It still might need a power supply. This generation of machine is probably embraced in the ongoing free repair program:

http://docs.info.apple.com/article.html?artnum=302181

Thanks very much! I'll check that out.
-ez

Message #6 - Posted 2007/10/11 - Evan Z

sbt wrote:

Previously, Evan Z wrote:

Hi all,

My iMac G5 (10.4.10) keeps on turning off for no reason. I'll walk away from the computer, come back an hour later, and it'll be shut down. It almost always happens when I'm not using it, for whatever that's worth.

About 2 years ago, the same computer would shut down every time it went to sleep. Apple replaced the power supply and that solved the problem.

This time, there doesn't seem to be any connection to sleep mode. I've left it asleep overnight, and it's still been on in the morning. On the other hand, I know it's shut down minutes after I walked away from it, when it was still awake.

I've run disk repair and the hardware test since this started happening, and both showed no problems.

Does anyone have any thoughts about what this might be? Is there anything on the computer that I can check for clues (logs or anything like that)?

Thanks for any help you can offer!

Gremlins? Is it a coincidence that the same thing started happening to my kid brother's G5 iMac the day before yesterday? Even though his is still under AppleCare, he couldn't afford to be without it for the few days, so he moved his Intel iMac purchase up a few weeks (was going to buy after Leopard came out), did the Migration Assistant thing, and took his in for service -- we should know the cause in a few days.

I had a similar problem with a Wintel box and a PowerMac G4 a few years back -- in both cases it turned out to be power cords/plugs that just weren't seating properly. That's now the first thing I check.

It turns out my computer is still AppleCare eligible (until Monday--that was close!), and also that the free repair program ends after 3 years, when AppleCare ends.

Anyway, I called AppleCare today after my computer shut down twice in 2 hours, once in the middle of running Disk Repair of the OS X DVDs. The woman had me disconnect all peripherals (speakers which are always on and printer which almost never is) and reset the PMU. It hasn't shut down since then; it's been about 2 hours. I hope that solves it, but I'm skeptical.

-ez

Message #7 - Posted 2007/10/11 - Ockham's Razor

Previously, Evan Z wrote:

sbt wrote:

Previously, Evan Z wrote:

Hi all,

My iMac G5 (10.4.10) keeps on turning off for no reason. I'll walk away from the computer, come back an hour later, and it'll be shut down. It almost always happens when I'm not using it, for whatever that's worth.

About 2 years ago, the same computer would shut down every time it went to sleep. Apple replaced the power supply and that solved the problem.

This time, there doesn't seem to be any connection to sleep mode. I've left it asleep overnight, and it's still been on in the morning. On the other hand, I know it's shut down minutes after I walked away from it, when it was still awake.

I've run disk repair and the hardware test since this started happening, and both showed no problems.

Does anyone have any thoughts about what this might be? Is there anything on the computer that I can check for clues (logs or anything like that)?

Thanks for any help you can offer!

Gremlins? Is it a coincidence that the same thing started happening to my kid brother's G5 iMac the day before yesterday? Even though his is still under AppleCare, he couldn't afford to be without it for the few days, so he moved his Intel iMac purchase up a few weeks (was going to buy after Leopard came out), did the Migration Assistant thing, and took his in for service -- we should know the cause in a few days.

I had a similar problem with a Wintel box and a PowerMac G4 a few years back -- in both cases it turned out to be power cords/plugs that just weren't seating properly. That's now the first thing I check.

It turns out my computer is still AppleCare eligible (until Monday--that was close!), and also that the free repair program ends after 3 years, when AppleCare ends.

Anyway, I called AppleCare today after my computer shut down twice in 2 hours, once in the middle of running Disk Repair of the OS X DVDs. The woman had me disconnect all peripherals (speakers which are always on and printer which almost never is) and reset the PMU. It hasn't shut down since then; it's been about 2 hours. I hope that solves it, but I'm skeptical.

Have you reconnected all the peripherals?

Es ist nichts schrecklicher als eine t‰tige Unwissenheit.

Johann Wolfgang von Goethe

Message #8 - Posted 2007/10/11 - Evan Z

Ockham's Razor wrote:

Previously, Evan Z wrote:

sbt wrote:

Previously, Evan Z wrote:

Hi all,

My iMac G5 (10.4.10) keeps on turning off for no reason. I'll walk away from the computer, come back an hour later, and it'll be shut down. It almost always happens when I'm not using it, for whatever that's worth.

About 2 years ago, the same computer would shut down every time it went to sleep. Apple replaced the power supply and that solved the problem.

This time, there doesn't seem to be any connection to sleep mode. I've left it asleep overnight, and it's still been on in the morning. On the other hand, I know it's shut down minutes after I walked away from it, when it was still awake.

I've run disk repair and the hardware test since this started happening, and both showed no problems.

Does anyone have any thoughts about what this might be? Is there anything on the computer that I can check for clues (logs or anything like that)?

Thanks for any help you can offer!

Gremlins? Is it a coincidence that the same thing started happening to my kid brother's G5 iMac the day before yesterday? Even though his is still under AppleCare, he couldn't afford to be without it for the few days, so he moved his Intel iMac purchase up a few weeks (was going to buy after Leopard came out), did the Migration Assistant thing, and took his in for service -- we should know the cause in a few days.

I had a similar problem with a Wintel box and a PowerMac G4 a few years back -- in both cases it turned out to be power cords/plugs that just weren't seating properly. That's now the first thing I check.

It turns out my computer is still AppleCare eligible (until Monday--that was close!), and also that the free repair program ends after 3 years, when AppleCare ends.

Anyway, I called AppleCare today after my computer shut down twice in 2 hours, once in the middle of running Disk Repair of the OS X DVDs. The woman had me disconnect all peripherals (speakers which are always on and printer which almost never is) and reset the PMU. It hasn't shut down since then; it's been about 2 hours. I hope that solves it, but I'm skeptical.

Have you reconnected all the peripherals?

Nope. I never did reconnect the peripherals, and the computer still shut down twice in the past hour. I'm bringing it to an Apple-authorized service provider, hopefully tomorrow.

Oh well. I've already had to replace the power supply on this computer twice, the hard drive once, and one other part whose name I'm forgetting once (it was the longest and most challenging one of them all).

-ez
-ez

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