[rescue] Macintosh G5 troubleshooting

[John Francini]

> If it's going into Open Firmware still, try:
> 
> reset-nvram
> reset-all
> 
> It's a long shot but I've seen it fix otherwise unusable machines. You 
> might also replace the hard drive and then do those same commands again. 
> I had a batch three that were fixed that way.
> 

Also, it may be long enough that the PRAM battery has died; a dead one can render a machine unbootable.  Another thing to check is to see exactly *where* the boot is failing, by holding down the Command-V key pair (for verbose boot) when booting from the CD, until the grey screen is replaced with a white-on-black text console.

You can also boot holding down Command-S to boot to single-user mode.

j