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I was thinking it could be SOME kind of problem with the jumpers. However, I know for sure that one of them was on cable select, and the other was on slave or something.
You want all of them on CS. There can only be one master and one slave and mixing CS into that becomes a problem. Make them all CS. The Mac is smart enough to figure out which one is the boot drive.
 
You want all of them on CS. There can only be one master and one slave and mixing CS into that becomes a problem. Make them all CS. The Mac is smart enough to figure out which one is the boot drive.

Okay, I'll check out the jumper settings to make sure they are all on CS.
 
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