[G4] Mirror Door G4 dual 1 GHz power problems

[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.





On Jan 11, 2009, at 9:51 AM, Jim Robertson wrote:

> 1. Computer won't start up from the "power up" button unless I pull  
> and
> reinsert the power cord.
> 2. When I do this, it often reverts to an ancient date (1967 as I  
> recall).
> 3. The PCI ethernet card is reporting an enormous number of recvd  
> errors in
> Network Utility.
>
> I've zapped PRAM, replaced the PRAM battery (but found there's  
> still 3.7
> volts in the original battery after doing so), and reset the  
> motherboard,
> yet all problems persist.
>
> Is it time to give up on this box? It has an upgraded video card that
> supports two monitors, 2 Gigs of RAM, and a 250 Gbyte hard drive,  
> so I don't
> want to toss it if it's salvageable, but I don't know what to try  
> next.
>
> Currently it's running OS X 10.5.0 (it cannot download the combined  
> 10.5.6
> updater because of the ethernet traffic errors; it typically gives up
> because of network problems HOURS into the download attempt.
>
> Thanks so much,
>
> Jim Robertson