Inspect the IDE cable and make sure it's OK. On some early Mark 1 models, a messy solder on a jumper on the motherboard might have scarred the cable. Repair this as necessary. In my case I had to file down the jumper, resolder it, and protect the damaged cable with electrical tape. If you have to do this, use extreme caution and don't let any filings stay inside the case.
I know, not exactly the same situation, but the same concept.
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