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G4 Powerbook: Kernel Panic when plugging in power adaptor

Message #1 - Posted 2006/10/08 - KP

Sorry for the query post. I have a 1Ghz G4 Powerbook running 10.4.7 A week or so ago I was watching a DVD when everything locked and I got a kernel panic display. Wondering if my machine had overheated I turned everything off and left it for an hour or so before re-booting.

Since that event my Powerbook starts perfectly *every time* from its battery. The kernel panic returns however as soon as I plug in the external power adaptor - literally every time. It wont boot with the Power adaptor connected, preferring instead to panic at the login screen. When switched off the powerbook charges fine from the adaptor but simply refuses to behave in any way - whilst running - with it conected.

I initially checked the RAM etc and found 1 of my modules was reporting failed - I removed that and got my startup bong back (which had gone missing in action) - still however I can't get the P/Book to work correctly...

I have checked permissions, run fsck, reset PRAM and PMU to no avail.

Unfortunately I have intermittent Internet access due to work and my install/check hardware discs are 120 miles away for the next few weeks!

I'm hoping someone may have heard of a similar problem and associated fix or can post some ideas to try?

Any advice gratefully received - it's either try to fix it or put up with it until I can get home to my discs!!

Cheers

Kev

Message #2 - Posted 2006/10/08 - Jon B

KP wrote:

Sorry for the query post. I have a 1Ghz G4 Powerbook running 10.4.7 A week or so ago I was watching a DVD when everything locked and I got a kernel panic display. Wondering if my machine had overheated I turned everything off and left it for an hour or so before re-booting.

Since that event my Powerbook starts perfectly *every time* from its battery. The kernel panic returns however as soon as I plug in the external power adaptor - literally every time. It wont boot with the Power adaptor connected, preferring instead to panic at the login screen. When switched off the powerbook charges fine from the adaptor but simply refuses to behave in any way - whilst running - with it conected.

Check the energy saver preferences, usually the PB runs at reduced performance when just on the battery, try changing the mains settings to reduced performance, then plugging in the power adapter. OS X it very sensitive to failing hardware, either CPU or ram, and repeated KPs are normally a sign of this. I doubt this is software related, but this may at least allow you to run on the mains.

Jon B
Above email address IS valid.
<http://www.bramley-computers.co.uk/> Apple Laptop Repairs.

Message #3 - Posted 2006/10/09 - KP

On Oct 8, 7:50 pm, Jon B wrote:

KP wrote:

Sorry for the query post. I have a 1Ghz G4 Powerbook running 10.4.7 A week or so ago I was watching a DVD when everything locked and I got a kernel panic display. Wondering if my machine had overheated I turned everything off and left it for an hour or so before re-booting.

Since that event my Powerbook starts perfectly *every time* from its battery. The kernel panic returns however as soon as I plug in the external power adaptor - literally every time. It wont boot with the Power adaptor connected, preferring instead to panic at the login screen. When switched off the powerbook charges fine from the adaptor but simply refuses to behave in any way - whilst running - with it conected.

Check the energy saver preferences, usually the PB runs at reduced performance when just on the battery, try changing the mains settings to reduced performance, then plugging in the power adapter. OS X it very sensitive to failing hardware, either CPU or ram, and repeated KPs are normally a sign of this. I doubt this is software related, but this may at least allow you to run on the mains.
--
Jon B

Jon, thanks - your advice was very accurate.

I first changed the Power Adapter settings from a 'Custom' setting to 'Normal' and left the CPU setting at Automatic - it worked for a while until I tried to load an app then Kernel Panicked again. I re-booted and set the CPU to 'reduced' - it's now been running at least long enough for me to load Safari and type this reply!!

Now I guess I need to narrow down whether this is a RAM or CPU issue? I might have a friend with some spare 'good' ram to let me try - are there any other ways of checking the CPU etc without having access to my hardware check CDs?

This fault is beginning to sound expensive!!

Thanks again

Kev

Message #4 - Posted 2006/10/10 - Jon B

KP wrote:

On Oct 8, 7:50 pm, Jon B wrote:

KP wrote:

Sorry for the query post. I have a 1Ghz G4 Powerbook running 10.4.7 A week or so ago I was watching a DVD when everything locked and I got a kernel panic display. Wondering if my machine had overheated I turned everything off and left it for an hour or so before re-booting.

Since that event my Powerbook starts perfectly *every time* from its battery. The kernel panic returns however as soon as I plug in the external power adaptor - literally every time. It wont boot with the Power adaptor connected, preferring instead to panic at the login screen. When switched off the powerbook charges fine from the adaptor but simply refuses to behave in any way - whilst running - with it conected.

Check the energy saver preferences, usually the PB runs at reduced performance when just on the battery, try changing the mains settings to reduced performance, then plugging in the power adapter. OS X it very sensitive to failing hardware, either CPU or ram, and repeated KPs are normally a sign of this. I doubt this is software related, but this may at least allow you to run on the mains.
--
Jon B

Jon, thanks - your advice was very accurate.

I first changed the Power Adapter settings from a 'Custom' setting to 'Normal' and left the CPU setting at Automatic - it worked for a while until I tried to load an app then Kernel Panicked again. I re-booted and set the CPU to 'reduced' - it's now been running at least long enough for me to load Safari and type this reply!!

Now I guess I need to narrow down whether this is a RAM or CPU issue? I might have a friend with some spare 'good' ram to let me try - are there any other ways of checking the CPU etc without having access to my hardware check CDs?

This fault is beginning to sound expensive!!

I wouldn't trust that disk as far as I could throw it, I've watched it pass a machine with obvious logic board failure even though the machine was suffering the usual graphical problems as it did its test.

I hope for your sake it is ram, CPU is rather expensive, feel free to drop me a line if you want to discuss it further, but logic boards are expensive. Check out Zoaras posts regards his iBook & trading standards etc as although the warranty is one year, you are covered under consumer law for a lot longer. While it is running do start backing it up. --
Jon B
Above email address IS valid.
<http://www.bramley-computers.co.uk/> Apple Laptop Repairs.

Message #5 - Posted 2006/10/10 - KP

On Oct 10, 9:34 am, Jon B wrote:

I wouldn't trust that disk as far as I could throw it, I've watched it pass a machine with obvious logic board failure even though the machine was suffering the usual graphical problems as it did its test.

I hope for your sake it is ram, CPU is rather expensive, feel free to drop me a line if you want to discuss it further, but logic boards are expensive. Check out Zoaras posts regards his iBook & trading standards etc as although the warranty is one year, you are covered under consumer law for a lot longer. While it is running do start backing it up.

Thanks Jon - I'll let you know how it goes.

Kev

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