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There was contamination on/between the leads on several IC's. I could see the discolorization with a magnifying glass.
I soaked the leads with alcohol, using a que tip. Then ran a small screwdriver tip between the leads, again using the magnifying glass. The third step was to blow out all alcohol, etc. with compressed air. After repeating this several times on both sides of the MB, I reassembled it enough to fire it up and it worked!
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