Repair manual

6
For tray loaders just use the link above to version 1.2 firmware
(does the firmware fix problems for tray loaders or only slot
loaders?).
If you are running OS 9.0.x on a slot loader, you first need to
upgrade to OS 9.1. To do this, boot from your original OS 9 CD
(hold down “c” during startup) and then run the updater, or follow
the instructions in the linked web page.
Firmware 4.1.9 only installs on a slot loader which has booted OS
9.1.x or OS 9.2.x from a local HD.
If you have OS X but not OS 9 installed on your HD, you have a
couple of options:
• install OS 9 alongside OS X on the HD; there are instructions
(where) on the Apple website. You will need an OS 9 CD.
• beg/borrow/steal a compatible HD which has OS 9.1.x or OS
9.2.x installed and connect it to the iMac. Does it work if you
connect via firewire or USB or do you have to plug it into the
logic board bus? Alternatively take out the iMac’s HD and
connect it to another computer in order to install OS 9.1.x or
OS 9.2.x. It’s also worth loading the firmware updater onto
the HD at this stage.
OS X 10.2 or higher shouldn’t install on a slot loading iMac that
doesn’t have firmware 4.1.9. But it seems that sometimes it does.
With any luck you selected the option to leave OS 9 on the HD.
Otherwise proceed as above.
1.2 If you have symptom S1 you need the “sleep/wake up” trick to get
a visible display showing. After the iMac has booted up (listen for
hard disk activity, and remember you may need to press return a
couple of times to clear any dialogs if the iMac didn’t shut down
properly), briefly press the power button on the front to send the
iMac to sleep. When the power lamp starts pulsing orange, press
the space bar to wake the iMac up. With any luck, your screen
image will now be visible.
Alternatively with symptom S1, many of the slot-loading iMacs
(apart from the original 350 MHz CD-ROM slot loader) have an
external VGA port (PC-style socket 15 pins on 3 rows) to which you
can connect a PC monitor. This makes life much easier if you can
get hold of one. Look for the vented panel round the back just
above the memory access panel. Most PC monitors will work as long
as they aren’t too old – the iMac as fairly high refresh rates of 75Hz
on 1024x768, 95Hz on 800x600, and 117Hz on 640x480.
1.3 If you still can’t get the screen to display, you should still be able to
apply the firmware update by getting OS 9.1.x or OS 9.2.x onto a
HD and popping the firmware updater into the Startup Items folder
(you can either take out the iMac’s HD and connect it to another