Start-up's sometimes fails...

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Palle Jensen - 10 Oct 2007 21:08 GMT

Once or twice I have experienced that my iMac has failed to start up.

Hits the power button. Screen shows white/grey picture with apple in
the middle. Then nothing.

Power off and on again and everything is OK.

I have verified disks and fixed permissions. That's basicly all I know
that I can do (New Mac user).

Where would I start to search if this problems comes back?

System :
--------------------------------------
Model Name:    iMac
Model Identifier:    iMac5,1
Processor Name:    Intel Core 2 Duo
Processor Speed:    2.16 GHz
Number Of Processors:    1
Total Number Of Cores:    2
L2 Cache (per processor):    4 MB
Memory:    2 GB
Bus Speed:    667 MHz
Boot ROM Version:    IM51.0090.B09
--------------------------------------

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Venlig hilsen / Best regards
Palle Jensen
If you want to E-mail me then please remove the US President.

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Clark Martin - 12 Oct 2007 06:06 GMT

> Once or twice I have experienced that my iMac has failed to start up.
>
[quoted text clipped - 7 lines]
>
> Where would I start to search if this problems comes back?

Odds are it's not permissions, it doesn't sound like it's getting far
enough for permissions to matter.

First thing to check / replace is the PRAM battery.

If you have a voltmeter handy measure the battery voltage. Anything
over 3V is good.

If that's okay try resetting the PMU (Power Management Unit).

What kind of iMac (G3, G4, G5, Intel)?

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Clark Martin
Redwood City, CA, USA Macintosh / Internet Consulting

"I'm a designated driver on the Information Super Highway"

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Palle Jensen - 12 Oct 2007 12:09 GMT

> What kind of iMac (G3, G4, G5, Intel)?

I wrote all system info in the first posting:

Model Name: iMac
Model Identifier: iMac5,1
Processor Name: Intel Core 2 Duo
Processor Speed: 2.16 GHz
Number Of Processors: 1
Total Number Of Cores: 2
L2 Cache (per processor): 4 MB
Memory: 2 GB
Bus Speed: 667 MHz
Boot ROM Version: IM51.0090.B09

- I can't disassemle the iMac and meassure battery.

But resetteing PRAM and PMU sounds like an idea? But how?

--
Palle

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Florian Zschocke - 16 Oct 2007 08:52 GMT

Palle Jensen <LaboratorieX@gmail.com> schrieb:

>> What kind of iMac (G3, G4, G5, Intel)?
>
[quoted text clipped - 12 lines]
>
> - I can't disassemle the iMac and meassure battery.

Forget the battery. This is a new machine.

> But resetteing PRAM and PMU sounds like an idea? But how?

Zapping the PRAM is pressing 4 keys (command alt p r) at start while
you hear the start chime.
Forget the PMU - this is a desktop computer and a worse PMU would show
other symptoms.
After reseting the pram please try to boot in verbose mode (pressing v
or command-v) while you hear the start chime.
Post the last message you can read form the screen here.
I guess, if it hangs while gray screen with spinning pizza (or not),
there might be something wrong with your disk.
If that is true, you have to start in single user mode (pressing s or
command s while you hear the start chime) and than run fsck -fy from
the command line. Try to boot again.

Florian

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Mac Forum / General / Hardware / October 2007

Start-up's sometimes fails...