Update Firmware Before Installing Jaguar! - TidBITS 2002 archives
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.
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.
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iMac (Slot Loading): Install iMac Firmware 4.1.9 Before Mac OS X 10.2 or later - docs.info.apple.com
If you own an iMac (Slot Loading) computer, you must install the iMac Firmware Update 4.1.9 before installing Mac OS X 10.2 or later.
The iMac Firmware Update 4.1.9 is available on the Mac OS X Install CD Disc 1. It is also available online and can be downloaded if needed.
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Mac OS 9.1: Software and Before You Install document
This document contains the Software download links, how to prepare for installing Mac OS 9.1, and provides compatibility and basic troubleshooting information.
Important: This software update requires you to have Mac OS 9.0 - 9.0.4 installed on your Macintosh prior to installing the update.
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