Another problem that I HAVE CREATE in my iMac stay in the attempt to install Windows XP via boot camp on it.
The problem is also so BIG, because i block the open firmware via a password (in iMAC intel there isn’t open firmware, but EFI. If you go to utility you can set a password to a missing open firmware function).
After a afternoon of panic, the solve idea was to remove a bank of memory, restart the iMAC, shut down, insert the bank of memory and restart.
IT WORKS!