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FIX via TIDBITS: iMac|firmware|OSX v. 10.2
Authored by: mo on Oct 29, '02 04:52:57PM

1) Installing Jaguar on some slot-loading iMacs _can_ render the
machine unusable by blacking out the internal display, even when
trying to start up in Mac OS 9. The bug is apparently in Jaguar,
not the installer.
2) You can avoid the problem altogether by updating your iMac's
firmware _before_ installing Jaguar. The current firmware version
is 4.1.9; it's a 1.2 MB download.(chech install CD for included firmware)

**Seeing Black?** If you've already attempted to install Jaguar
and are looking at a black screen, you can recover, but it's not
simple. Essentially, you must find a way to update your iMac's
firmware from a writable drive without having use of the iMac's
screen.
Perhaps the best approach is to open the iMac, remove its hard
drive, and connect the hard drive to a second computer (like a
Power Mac G3 or G4 with an available drive bay). Then copy the
firmware updater to the iMac's drive, install a remote control
program like Timbuktu onto the hard drive and configure it to
allow incoming access, and set the drive to boot in Mac OS 9.
Next, move the hard drive back to your iMac and boot the machine
in Mac OS 9 (the screen will still be black). Then, connect to
the iMac over a network from another Macintosh using the remote
control program and run the firmware updater. Once you've done
that, the iMac's video should be restored. TidBITS#653/28-Oct-02



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