That only helps if you have a second machine which is configured as a tftp
server...
To boot from CD-ROM, you need to give the command "boot cdrom" at the open
firmware prompt (open firmware is the Sun equivalent of BIOS).
When you power on the machine, do you get to the open firmware prompt
("ok")?
If not and you have a Sun keyboard, you can probably get there by
pressing "Stop-A" (top-left function key on the left of the keyboard +
the "A" key).
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