[G4] Sawtooth cycles on-off

[CDT]

You might want to try the Open Firmware resets:  Restart the computer  
and immediately after the chime, press and hold the Option, Command,  
letter "O" and letter "F" keys simultaneously until a message appears  
telling you to release them.  (The machine is now booted into Open  
Firmware).  Then type the following lines exactly and press the  
return key:

reset-nvram (hit the return key)
set-defaults (return)
reset-all (return)

The Mac will restart and should boot normally.  If you are still  
having problems, it may be time for a PMU reset.  This link will walk  
you through it.  http://support.apple.com/kb/HT1939  If you want more  
background info, do a google search for "apple MDD PMU reset" which  
will bring up a plethora of links.

Dan T


On Apr 15, 2009, at 8:07 AM, Peter Webster wrote:

> Dear Wise-List:
>
> My 500GHz Sawtooth, 1 GB sdram, OS 10.3.9, external LaCie FireWire  
> 120GB, esternal Maxtor USB 160GB, 17" flat Studio monitor, is  
> sometime cycling on-off.
>
> The "on" button on the computer case stays lit, I can hear the CPU  
> powering down, then up, then down, and last time, the monitor went  
> dark and I had to pull the plug.
Snip