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Does G5 Have Automatic Shutdown to Prevent Overheating?

Message #1 - Posted 2006/07/23 - Vik Rubenfeld

Yesterday I went into the office and saw that my dual 1.8gz G5 had shut down for some reason. I hit the restart button, and it wouldn't boot. I got a blue screen. For a fraction of a second I saw the spinning icon that means the system is booting, but then that went away, leaving a flat blue screen.

It was super-hot here yesterday, and I thought possibly the disk drive or the motherboard had gotten fried.

Late last night, I hit the restart button, and the system booted perfectly.

So I'm wondering what happened. Does the G5 have automatic shutdown to prevent overheating?

Message #2 - Posted 2006/07/23 - Kevin McMurtrie

Previously, Vik Rubenfeld wrote:

Yesterday I went into the office and saw that my dual 1.8gz G5 had shut down for some reason. I hit the restart button, and it wouldn't boot. I got a blue screen. For a fraction of a second I saw the spinning icon that means the system is booting, but then that went away, leaving a flat blue screen.

It was super-hot here yesterday, and I thought possibly the disk drive or the motherboard had gotten fried.

Late last night, I hit the restart button, and the system booted perfectly.

So I'm wondering what happened. Does the G5 have automatic shutdown to prevent overheating?

I seem to recall that it sleeps when it overheats.

Anyways, super hot to you is not super hot to a computer. The chips are designed to run extremely hot. You might have some components that are failing or the hard drive might not be rated for high temperatures.

Message #3 - Posted 2006/07/24 - Hans Aberg

Previously, Vik Rubenfeld wrote:

Yesterday I went into the office and saw that my dual 1.8gz G5 had shut down for some reason. I hit the restart button, and it wouldn't boot. I got a blue screen. For a fraction of a second I saw the spinning icon that means the system is booting, but then that went away, leaving a flat blue screen.

Mac OS X can take a long time to restart, especially if the shutdown was not normal. Like several tens of minutes, or longer. The screen in†digital mode, will look just black, so it will look like the†computer is broken.

It was super-hot here yesterday, and I thought possibly the disk drive or the motherboard had gotten fried.

Late last night, I hit the restart button, and the system booted perfectly.

So, if you let the computer stand for awhile, it†perhaps had time to do some of the cleanup it was doing, and will start quicker the next time.

So I'm wondering what happened. Does the G5 have automatic shutdown to prevent overheating?

As for the shutdown:†hard to tell. You might have had a power let down - check the cables.

Carefully read the operation conditions of your†computer (like temperatures), and make sure these are fulfilled, because it will otherwise break. Currents in semiconductors depend heavily on temperature, and if out of range, will cause†unbalance in the electrical circuitry, which†can†cause it to burn out.

Hans Aberg

Message #4 - Posted 2006/07/25 - Simon Slavin

On 23/07/2006, Vik Rubenfeld wrote in message <vikr- 6BBC8A.12001523072006@news.west.earthlink.net>:

So I'm wondering what happened. Does the G5 have automatic shutdown to prevent overheating?

Yes it does. I'm surprised that the /room/ was so hot it would shut down immediately, but you can definitely shut down a G5 by leaving it running and not allowing its fans to cool it down.

If the room was very hot (i.e. the heatwave I thought had ended) then it makes perfect sense for the G5 to shut down immediately it realised how hot it was.

Simon.

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