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#10487 - 06/10/10 04:02 PM Why Laptop not start?
kevs Offline


Registered: 12/07/09
I've only had a laptop a couple of years. Every few months, even fully charged it wont start. I hold down on power button, go away try again. Finally starts. What is this about? thanks!

I know that's vague, but that's the pattern.

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#10493 - 06/10/10 09:59 PM Re: Why Laptop not start? [Re: kevs]
artie505 Online


Registered: 08/04/09
Have you ever tried resetting your PMU or, as the case may be, SMC?
_________________________
The new Great Equalizer is the SEND button.

In Memory Of Harv: Those who can make you believe absurdities can make you commit atrocities. ~Voltaire

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#10505 - 06/11/10 05:17 PM Re: Why Laptop not start? [Re: artie505]
kevs Offline


Registered: 12/07/09
Artie, thanks, what are abbreviations.

First pram?
I've never seen it fix anything.

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#10506 - 06/11/10 10:58 PM Re: Why Laptop not start? [Re: kevs]
artie505 Online


Registered: 08/04/09
> First pram?
I've never seen it fix anything.


You've just never run into an issue for which it was the appropriate troubleshooting technique.

PMU = Power Management Unit

SMC = System Management Controller

SMU = System Management Unit

(Sorry... I forgot about SMU in my first post.)
_________________________
The new Great Equalizer is the SEND button.

In Memory Of Harv: Those who can make you believe absurdities can make you commit atrocities. ~Voltaire

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#10509 - 06/12/10 02:22 AM Re: Why Laptop not start? [Re: kevs]
jchuzi Online


Registered: 08/04/09
Loc: New York State
Originally Posted By: kevs
what are abbreviations.

First pram?
I've never seen it fix anything.
PRAM is Parameter Random Access Memory. As Artie knows from personal experience, it can sometimes fix an issue. To see some other possibilities, read Mac OS X: What's stored in PRAM.
_________________________
Jon

OS 10.14.4, iMac Retina 5K 27-inch, late 2014, 3.5 GHz Intel Core i5, 1 TB fusion drive, 16 GB RAM, Epson SureColor P600, Photoshop CC, Lightroom CC, MS Office 365

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#10539 - 06/14/10 04:03 PM Re: Why Laptop not start? [Re: jchuzi]
kevs Offline


Registered: 12/07/09
I tried re-setting Pram twice on the laptop. It did not work, just restarted as normal -- why could that be?

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#10541 - 06/15/10 02:20 AM Re: Why Laptop not start? [Re: kevs]
jchuzi Online


Registered: 08/04/09
Loc: New York State
Did you try Artie's other suggestions?
_________________________
Jon

OS 10.14.4, iMac Retina 5K 27-inch, late 2014, 3.5 GHz Intel Core i5, 1 TB fusion drive, 16 GB RAM, Epson SureColor P600, Photoshop CC, Lightroom CC, MS Office 365

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#10543 - 06/15/10 05:55 AM Re: Why Laptop not start? [Re: jchuzi]
artie505 Online


Registered: 08/04/09
Originally Posted By: jchuzi
Did you try Artie's other suggestions?

WRONG!

I did not mention zapping PRAM let alone suggest it. My "other suggestions" are the only suggestions I made.
_________________________
The new Great Equalizer is the SEND button.

In Memory Of Harv: Those who can make you believe absurdities can make you commit atrocities. ~Voltaire

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#10544 - 06/15/10 08:25 AM Re: Why Laptop not start? [Re: artie505]
kevs Offline


Registered: 12/07/09
so don't bother with Pram?

SMC = System Management Controller
is this 2nd suggestion?
don't know what it is.

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#10545 - 06/15/10 08:36 AM Re: Why Laptop not start? [Re: kevs]
jchuzi Online


Registered: 08/04/09
Loc: New York State
Troubleshooting: My computer won't turn on has links for resetting SMC or PMU with various models. You didn't say which kind of laptop you had so that article should give you a link for your specific type of computer. For a summary of SMC, read Intel-based Macs: Resetting the System Management Controller (SMC).
_________________________
Jon

OS 10.14.4, iMac Retina 5K 27-inch, late 2014, 3.5 GHz Intel Core i5, 1 TB fusion drive, 16 GB RAM, Epson SureColor P600, Photoshop CC, Lightroom CC, MS Office 365

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#10548 - 06/15/10 10:54 AM Re: Why Laptop not start? [Re: kevs]
Virtual1 Offline


Registered: 08/04/09
Loc: Iowa
I don't think you've mentioned what you have for a laptop. Is it an intel (macbook/mbp) or something older?
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I work for the Department of Redundancy Department

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#10550 - 06/15/10 11:34 AM Re: Why Laptop not start? [Re: Virtual1]
kevs Offline


Registered: 12/07/09
2 year old Intel.

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#10635 - 06/19/10 03:59 PM Re: Why Laptop not start? [Re: kevs]
kevs Offline


Registered: 12/07/09
SMC,
says do as very last resort. But that point would be when the laptop wont start, so can do anything at that point.
This is too intermittent to even know anything definitive.

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#10644 - 06/19/10 11:00 PM Re: Why Laptop not start? [Re: kevs]
artie505 Online


Registered: 08/04/09
> "But that point would be when the laptop wont start...."

Is that a quote from an Apple or other document or your own inference?
_________________________
The new Great Equalizer is the SEND button.

In Memory Of Harv: Those who can make you believe absurdities can make you commit atrocities. ~Voltaire

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#10649 - 06/20/10 10:25 AM Re: Why Laptop not start? [Re: kevs]
Hal Itosis Offline


Registered: 09/03/09
Loc: 10.6.8 (build 10K549)
Originally Posted By: kevs
I've only had a laptop a couple of years. Every few months, even fully charged it wont start. I hold down on power button, go away try again. Finally starts. What is this about? thanks!

I know that's vague, but that's the pattern.

Push harder, hold longer... wait for chime.

Simple.

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#10650 - 06/20/10 01:15 PM Re: Why Laptop not start? [Re: artie505]
macnerd10 Offline


Registered: 08/04/09
Loc: Los Angeles, CA
To clarify, are these the same systems/units, just different names for different configurations/hardware?
_________________________
Alex
3.1 GHz 13" MacBook Pro 2015, 8 GB RAM, OS 10.11.2, Office 2011, TimeWarner Cable
2.8 GHz Xeon Mac Pro 2010, 16 GB RAM, OS 10.11.2, Office 2011, LAN

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#10651 - 06/20/10 02:18 PM Re: Why Laptop not start? [Re: macnerd10]
artie505 Online


Registered: 08/04/09
Originally Posted By: macnerd10
To clarify, are these the same systems/units, just different names for different configurations/hardware?

I can't answer that with specifics, Alex, but I think I can safely say that they're more or less equivalent in functionality, with PMU, I believe, being applicable to PPC Macs and SMU and SMC being applicable to various Intel Macs.
_________________________
The new Great Equalizer is the SEND button.

In Memory Of Harv: Those who can make you believe absurdities can make you commit atrocities. ~Voltaire

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#10652 - 06/20/10 03:17 PM Re: Why Laptop not start? [Re: Hal Itosis]
kevs Offline


Registered: 12/07/09
Hal, you may have the answer there! (I hope)

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