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May 8, 2012 8:54 AM in response to Knight212by Paul_31,You should have better luck re-posting in the following link as this is the iMac Intel forum and G5's are PPC:
https://discussions.apple.com/community/desktop_computers/imac_powerpc?view=disc ussions
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May 8, 2012 9:05 AM in response to Knight212by Eric Fauque,This forum is for intel imacs.
You might get more replies in the power pc forum.
https://discussions.apple.com/community/desktop_computers/imac_powerpc
You can try doing a PMU reset (Power Management Unit)
- Turn off the computer by choosing Shut Down from the Apple menu, or by holding the power button until the computer turns off.
- Unplug all cables from the computer, including the power cord.
- Wait 10 seconds.
- Plug in the power cord while simultaneously pressing and holding the power button on the back of the computer.
- Let go of the power button.
- Press the power button once more to start up your iMac.
Note that this will only work on some G5 iMac models. I don't know what model you have.
See these articles for more info.