Hi all!

After many more tests, I think that there's a problem either with the PCI bus or the Maxtor SATA hard disk...

It's the only way to explain that:
- I "setenv boot-command multi-boot"
- I resetted the G5 and could see the MorphOS disk icon in the boot picker (but choosing it brought a "gray screen").
Now I was sure that "boot-command" was doing something, though!

- I "load hd:,\\boot.img" and saw the expected output ("... DO-QUIESCE finished.")
- Then I "go" and MorphOS started.
- I restarted the computer
- I "boot hd:,\\boot.img" and, again, MorphOS started.
Now I was sure that I had the correct "boot-command"!

I "setenv boot-command boot hd:,\\boot.img" and restarted the G5 and got... a black screen!

So the only explanation would be that pressing Option+Command+O+F and typing "bye" give time to the PCI bus or the hard disk or something to initialise???

Guess this'll be the most secure computer at home: only I'll know how to boot it