Hi Ken,

You said you are running 10.4.11 on both machines?
>> Running 10.4.11 on both machines.

Are you receiving this message:  "You need to restart your computer" 
<http://support.apple.com/kb/TS3742>
If so, that is a Kernel Panic.

If you aren’t running 10.4.11 BUT 10.6.8 on both machines …
/Library/Logs/DiagnosticReports  & CrashReporter

Understanding crash logs isn’t easy and it’s hard (sometimes impossible) to 
decipher the cause of the problem. 
Take a look at Apple’s Crash Reporter document at 
<http://developer.apple.com/technotes/tn2004/tn2123.html>

Also look at Tutorial: An introduction to reading Mac OS X crash reports
<http://www.macfixit.com/article.php?story=20060309075929717>

Kernel panics are usually caused by a hardware problem – frequently RAM, a USB 
device or a Firewire device. 
What external devices do you have connected?
When trying to troubleshoot problems, disconnect all external devices except 
your monitor, keyboard and mouse. Do you experience the same problems? 

Do you have an Apple Hardware Test disc? Running the Apple Hardware Test in 
Loop Mode is an excellent troubleshooting step for finding intermittent 
hardware problems. It is especially useful when troubleshooting intermittent 
kernel panics. 

If Loop Mode is supported by the version of the Apple Hardware Test you are 
using, you run the Extended Test in Loop Mode by pressing Control-L before 
starting the test. 'Looping On' should appear in the right window. Then click 
the Extended Test button.
The test will run continuously until a problem is found. If a problem is found, 
the test will cease to loop, indicating the problem it found. 

If the test fails, be sure to write down the exact message associated with the 
failure.In some cases, RAM problems did not show up until nearly 40 loops, so 
give it a good run.

If you are not receiving the above message which indicates a “Kernel Panic”, 
post back with more details as to what is happening please.

Chers,
Ronni

On 29/09/2011, at 2:06 PM, Ken Jackson wrote:

> Hi Ronnie,
> running 10.6.8 but no 'panic' log in Library/Logs?
> Doesn't mention 'Kernel Panic' on screen, just 'need to restart yoyr 
> computer', on both machines. Similar age I guess thats why I thought
> battery could be flat?
> Thanks,
> 
> Ken  
> 
> Thanks & regards,
> 
> Ken
> 
> 
> 
> On Thursday, 29 September 2011 at 1:14 PM, Ronda Brown wrote:
> 
>> 
>> On 29/09/2011, at 12:34 PM, Ken Jackson wrote:
>> 
>>> Hi folks,
>>> 
>>> my G4 & G5 are both repeatedly giving me the grey (restart your machine) 
>>> window!
>>> I zap the PRAM & it seems ok for a day or so & then reverts.
>>> Do I need a new PRAM battery? What else would resolve it?
>>> Running 10.4.11 on both machines.
>> 
>> Hi Ken,
>> 
>> Do you mean you are receiving the grey screen with message “you need to 
>> restart your computer”, a Kernel Panic?
>> 
>> Have you checked your "panic.log" in the folder /Library/Logs/ ?
>> The panic log contains information about the state of the machine at the 
>> time of the panic.
>> 
>> Might give us something more to go on.
>> 
>> Cheers,
>> Ronni
>> 
>> 17" MacBook Pro 2.3GHz Quad-Core i7 “Thunderbolt"
>> 2.3GHz / 8GB / 750GB @ 7200rpm HD
>> 
>> OS X 10.6.8 Snow Leopard  
>> OS X 10.7 Lion
>> Windows 7 Ultimate (under sufferance)

-- The WA Macintosh User Group Mailing List --
Archives - <http://www.wamug.org.au/mailinglist/archives.shtml>
Guidelines - <http://www.wamug.org.au/mailinglist/guidelines.shtml>
Settings & Unsubscribe - <http://lists.wamug.org.au/listinfo/wamug.org.au-wamug>