Repair manual

• disconnect power, remove memory and Airport cards, remove

battery. Replace battery, PMU/CUDA reset, replace memory (one

card only, pref. in a different slot), replace power cable, power on,

hold down “c” to start from original system install CD

• Caution! Risk of electrocution from high voltage

components! Risk of damage to computer! (slot-loading)

unplug video connector or briefly change screen type selector

• refer to repair manual

Other tips

• See the suggestions in the iMac user manual

• Blow dust off internal boards

• Reseat memory

• Check power connection/connector are good/try a different

cable/clean pins in power socket at back of iMac

• Check the power switch isn’t sticking on the power LED <link…>

can cause bootup problems or intermittent shutdowns

• If errors occur during bootup refer to your manual. You may have

an extensions conflict. Hold SHIFT during bootup to turn extensions

off. Hold down SPACEBAR during bootup to open the extensions

manager.

• Try suggestions for a dim CRT, if appropriate

• Upgrade to OS 9.2.2 if you want to run OS 9 as your main system

or in Classic mode. Upgrade path is 9.0.x ! 9.1.x ! 9.2.1 ! 9.2.2.

The last 3 can be downloaded from the Apple website. You must

have OS 9 already installed, or own an iMac OS 9 CD, in order to

get to 9.2.2

Summary of useful links

• Firmware 1.2 for tray-loading iMac

• Firmware 4.1.9 for slot-loading iMac

• OS 9.1 update for iMac with OS 9.0.x already installed

• OS 9.2.1 (update from 9.1.x)

• OS 9.2.2 (update from 9.2.x)

• How to differentiate between iMac models