I currently have OSX 10.2, I believe.  I can't confirm that because it
wont boot.
I tried resetting the PRAM as you suggested, but nothing changed.  I
have confirmed that the battery is still giving its rated voltage.
I can try to install Panther, as I have obtained the disks,but I don't
know at what point to try the process.
As it is tryingto start, the computer shows the Apple logo, then
stops.
Depending on the location of the Ethernet cable, I get different
messages.
If the cable is in the board-mounted jack, the message reads:
sd-2.05a# Ethernet (Bmac):Link up at 100 Mbps - Half duplex.
If I am connected to the Ethernet card, the message describes the
Ethernet as : Link down.
I was using the plug-in card for Internet when the system worked, so I
do not understand why the messages vary, and I don't know what to do,
either.
Thanks for your assistance; I am beginning to understand some of the
process and I will continue to poke away.

Barrie
On Mar 15, 9:14 am, Cyrus Griffin <[email protected]> wrote:
> Your iMac should run Panther just fine (if it has the firmware update)  
> If not, make sure it has a VGA port on the back. (I have more info if  
> you're confused about that, we installed 10.4 onto a 400Mhz "Blueberry  
> iMac, and killed the video; since it didn't have an external VGA port,  
> we had to get a new motherboard) I would just try reinstalling 10.3  
> (Panther). What OS do you currently have on it? It might not be able  
> to run OS 8.6 if it's a Graphite/Snow/Sage/Ruby model.
> You can initialize and format a HD from the OSX installer, or run Disk  
> Utility. Same with OS 8.6, if I'm not mistaken. You also might try  
> reseting the Pram, by holding Option + Apple + R + P while you start  
> it up, and wait for about 4 or 5 chimes, then let go.
> Hope that helps,
>
>         -Cyrus
>
> On Mar 14, 2009, at 7:27 PM, old newbie wrote:
>
>
>
> > My 400Mhz G3 won't complete its boot.  It seems to be going through
> > the process, albeit slowly, but then stops, with a message at the top
> > of the screen, which still has only the Apple logo, which says
> > something like, "half duplex disabled", and the system stops.
> > I acquired a couple of G3 boxes, neither of which has a hard drive,
> > but with assurances that the mainboards were functional.  After
> > installing one of these in my original box, the bootup proceeded
> > exactly the same, including the message when it stopped.
> > My thought now is that the hard drive is corrupted or has gone south
> > completely.  Is there a way to determine which has occurred, or would
> > it be better to just replace the drive and start over?  If that is the
> > case, how do I go about that?  I have OS 8.6 and Panther available,
> > but do I need more, like something to format or otherwise enable the
> > hard disk?
> > As you can tell, I am not at all familiar with the Mac system
> > requirements.
> > Any advice is welcome.  I really don't want to give up on this, as it
> > has become a challenge of wits, in which I am obviously at a severe
> > disadvantage, but I'd like to pull a Forrest on this and make it go
> > somehow.
>
> > Barrie
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