Hard Drive and CD no worki

I have a previous post under a flashing ?/picasso folder subject.
I have concluded that there is some sort of problem (logic board?) that is causing both my Hard Drive and CD to not function at the same time. This occurs intermittently however.
After the problem occurs, if I wait a few days with the iBook disconnected from power, both drives will work again for a short time before they die again.
I can boot the iBook via firewire, and using both Hardware Test or TechTool Deluxe:
1. All diagnostics will pass on both HDD and CD drives, or
2. Neither the CD nor the HDD are visible.
While trouble shooting, I was able to reformat the HDD drive, but I have been unable to get it to function long enough to load even one of the OS X 10.3 CDs. It gets part way in and then dies, and becomes undetectable for a few days.
At this point I am resigned to use the iBook as a desktop tethered to and external HDD and CD drive.
Anyone have any suggestions?
iBook G3 (Dual USB) M8598LL/A
600/384/15G/DVD
Mac OS X 10.3.9

Hey Red,
I looke a little closer at the backside of the board where the cable socket is and found some corrosion. I got so excited that I had found the problem. I cleaned it all up, re-assembled it, and loaded 10.3 on it...so far so good.
So how bad was the corrosion? Was there some kind of contamination/liquid got into the board? Did it come from the top of the board? Do you see those tiny traces on the bottom of the board? There're around .1 mm wide and connect to a resistor array from that 50 pin connector. Examine all of that very carefully with a very strong magnifier. Depending on how bad the corrosion is/was there could be cracks in the pin to board connection and also compromised traces. The faults could be microscopic and would worsen when the board gets hot.
Since you found corrosion in one spot look in others to see if there's more. It only takes a tiny drop in the right place.
Congratulations by the way. It is exciting to discover the cause of the problem.
I don't think that you'll find any board diagrams for the iBook. You might have more luck trying to cross reference chip numbers.
Richard

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