Hey Rewes,
Well, this it what I have tried but when I do it the fan doesn't seem to lift.
Yes I see what you mean. I have a 17" iMac G5 here now all taken apart. Logic board, HD and power supply out.
So the fan keeper only lifts straight up. You can't get the lower fan out because the speaker housing is in the way.
The power supply must be out but the logic board can stay as well as the HD.
You remove three screws at the top of the inner frame. They're between the outer white housing and the inner metal frame. There are also two long screws at the bottom lower left and right of the logic board. These have to be removed as well since then go thru to the front bezel.
Lift up the top of the inner frame and the entire inner frame will lift up. Don't remove it too far as the display cable and the airport cables are still attached.
With the inner frame up, you can reach under and remove two screws holding the speaker in (T-10). The speaker pulls out over the locking shaft for the back.
With the speaker out you can lift that fan lock up and the fan will slide straight out the bottom.
Whew!
I'm pretty sure that's all the screws but don't force it. If you have a problem post back. I have to step out for a bit and will check here when I get back.
Richard
Message was edited by: spudnuty