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Command-Control-Power

Message #1 - Posted 2006/12/21 - Daniel Cohen

My fairly old Powerbook G4 usually does not seem to start up from the Power button (though I think I can hear the fan running).

It always starts if I use Command-Control-Power.

I guess that the cause of this is a dead backup battery, but I am wondering if anyone can confirm this as the most likely cause.

Also, I would be interested to know exactly what Command-Control-Power does that is different from the normal startup process.

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Message #2 - Posted 2006/12/21 - Steve Jones

Previously, Daniel Cohen wrote:

My fairly old Powerbook G4 usually does not seem to start up from the Power button (though I think I can hear the fan running).

It always starts if I use Command-Control-Power.

I guess that the cause of this is a dead backup battery, but I am wondering if anyone can confirm this as the most likely cause.

Also, I would be interested to know exactly what Command-Control-Power does that is different from the normal startup process.

Command-Control-Power is a forced restart. If you think the fan might be running, the computer could just be locked up while asleep. I've got a Titanium G4 that does this on occasion.

You can also try resetting the PMU:

http://docs.info.apple.com/article.html?artnum=14449

Steve

Message #3 - Posted 2006/12/22 - Heath Raftery

Daniel Cohen wrote:

My fairly old Powerbook G4 usually does not seem to start up from the Power button (though I think I can hear the fan running).

It always starts if I use Command-Control-Power.

Is it possible that is has started, but the screen does not come on until after you think it has failed to start, thus producing a coincidence between the C-C-P and power on? Only a WAG, because I'm not aware of any special C-C-P functionality when the computer is off.

Or... maybe the computer is asleep, and the Power button does nothing. C-C-P might restart the computer, tricking you into thinking it has just started up.

-- *--------------------------------------------------------*

^Nothing is foolproof to a sufficiently talented fool^ | Heath Raftery, HRSoftWorks _\|/_ |

*______________________________________m_('.')_m_________*
Message #4 - Posted 2006/12/22 - Daniel Cohen

Heath Raftery wrote:

Daniel Cohen wrote:

My fairly old Powerbook G4 usually does not seem to start up from the Power button (though I think I can hear the fan running).

It always starts if I use Command-Control-Power.

Is it possible that is has started, but the screen does not come on until after you think it has failed to start, thus producing a coincidence between the C-C-P and power on? Only a WAG, because I'm not aware of any special C-C-P functionality when the computer is off.

Or... maybe the computer is asleep, and the Power button does nothing. C-C-P might restart the computer, tricking you into thinking it has just started up.

These seem a possibility, but there is another factor. I hope there isn't an issue with the hard drive, but whenever the computer starts (either with Control-Command-Power or just with Power, which it occasionally does) there is a little grunt before the startup chime, and this does not occur when it fails to start from the Power button.

Did I say that it was a second-hand machine? Bought because I am in the UK, and have a close friend visiting from the USA. She regularly phones me to ask computer questions, and giving her this machine which has OS Xto take home will enable me to answer them knowing exactly what programs are on the machine (and even to use VNC to view her machine). --
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mail to the From address is never read

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