iMac G5, 17-inch Troubleshooting -
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General Information
To power the computer on with the back cover off:
1. First remove the back cover.
2. Plug in the power cord.
3. Press the power button. The LEDs will come on indicating the computer status.
4. To shut the computer off with the back cover off, press the power button for at least five
seconds. The green LEDs will go out.