By my reading you have 3 failures, your old drive was in the box at least twice (1st & 3rd), and both times it was an obvious HD issue that caused it to go down. Was the old drive in the box the 2nd time as well?
It's also not clear to me which drive the OS is installed on. Old or new? Or neither (i.e. are both the old and new secondary drives)?
If you manage to eliminate the drives as a problem I'd break out a magnifying glass and look for leaking capacitors, non-working fans, other heat related issues, on your board.
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