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Apple Desktops Discussion of Apple's desktop machines including Mac Pro, iMac, Power Mac, and mini

Fooling PMU/PAV board

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I am new to imacs (generally don't veer away from Linux) and as a consequence I upgraded an imac to MacOS X without upgrading the firmware first ....... has caused me no end of trouble -- resulting in a seemingly dead imac.

I found this website ( which described my problem exactly, and also said how I could bring the machine back to life again!

My problem now is the following instructions on the page ....

"(This applies to slot loaders only) We need to fool the PMU into running the full startup sequence even if it previously thought the PAV board was fried. One method is to unplug the video connector that connects the video card through to the motherboard. With the iMac sitting on its screen and its top off, go for the large metal connector held in by 2 screws that is right of centre and towards the top of the PAV board. Itís easy to spot as it is at an angle. Taking the top off the iMac exposes the high voltage CRT and exposes you to the risk of severe electric shock. Be very careful and donít go in there unless you know what you are doing. Make sure you remove the power cable first."

Now .... I could really do with a diagram / picture online that shows me exactly where the Video connector is - so I don't make any (more) mistakes....

Anyone got a link/pic they can email?


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Try this site for a full take apart guide: It is the Apple pdf service guide. I think the one you want is the second one in the iMac section.
Good luck.
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Originally Posted by Badger
Try this site for a full take apart guide: It is the Apple pdf service guide. I think the one you want is the second one in the iMac section.
Good luck.
Thanks for that Badger - exactly what I was looking for.


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