Thought I would pass along something that we found. Had a 6551ci the went to C0640. It had the two drives, so we went in to switch it to one. Put a new drive in it & C0640 came back up. Tried all kinds of stuff including putting two drives back in & changing the sim back to two, but the C0640 remained. It does say, but doesn't emphasize that the single HDD has to be at least 320gb. Anything less & it will not run.
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