Won't turn on (no chime, clicking, or fan)

This is crazy. While upgrading my Mom's 20" iMac with my 24" iMac (I upgraded to a 27" iMac) and doing a transfer of her iPhoto Library (a small 950 MB file) from the 20" to the 24" (via direct connection to each other with an Ethernet Cat5e cable). Everything was clicking along just fine, slow, but fine. Then I go back to check on the progress and find the screen is black. I thought it had merely gone to sleep. It was not asleep. It was dead. Wouldn't power back up at all.
I should give you a little back story so you'll have all the info in helping figure this issue out. The internal hard drive on the 20" went out about a year ago and I took it to the Apple store to be diagnosed & repaired. They said the internal drive replacement would cost $350. They suggested a less expensive option by getting an external hard drive (EHD). So, the OS & applications were put on the EHD and all has been good up until today. The EHD is slower than the internal drive was, but my Mom isn't fast either.
I had a "duh" moment after the iMac died thinking the EHD data transfer may have caused my problem. The duh moment came when I realized I didn't have to do a Mac to Mac ethernet transfer at all. All I had to do was disconnect the EHD from the 20" and plug it into the 24". Super DUH.
In summary, other than resets of the SMC and PRAM, and disconnecting power for LONG periods of time, is there something I'm overlooking? I've even used the powercord from my 24" on the 20" thinking it might have been bad. But I know I'm getting power because the EHD power light comes on when the iMac is plugged in. The iMac makes no sound at all when pushing the power button. No click, whir, chime or fan.
Your knowledge and expertise in this matter will be greatly appreciated.
CJ

LOL...I wish. I bought this one (my first) in May of 2006. She's an old bird. Like me.
Since then my Apple collection has grown and been shared with many in my family. I just can't see putting it out to pastures. It's been such a good machine. I'm going to see if there's a chance to repair it without too many green backs.
Thanks again for your reply.
CJ

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Hi, Chris. Welcome to Apple Discussions.
It sounds like you may be having logic board problems. Enough Dual USB G3 iBooks suffered from this problem that Apple began the iBook Logic Board Repair Extension Program in January of 2004. Check out the FAQ page and if the symptoms look familiar, give Apple a call.
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[Y]ou can often fix this yourself by removing the iBook's bottom housing, and placing a shim of any sort, about 1mm to 1.5mm thick, onto the raised square on the bottom shield. I use a Scotch mounting square--you can get them in hardware stores and many grocery stores. When you reinstall the bottom case, it will press against this shim, which will press against the graphics chip, and may allow the chip to come into better contact with the logic board.
John Sawyer
CJS Macintosh Repair
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http://www.ifixit.com/Guide/50.5.0.html
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http://support.apple.com/kb/TS2802
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