Blue iMac
It sounds like there's underlying problems unrelated to Panther. If the computer boots from the the old HD, but then the HD didn't show under Disk Utility, this is an intermittent problem.
Try replacing the cable that goes to the HD (if there is one), it may have become damaged sufficiently that things aren't working under "heavy use" (like trying to install an OS). If there is no cable, or replacing it doesn't work, I'd suggest putting the original HD in and selling the computer as-is.
Again, if it still botos from the old HD, then it's not a problem with the HD or Panther, unless the reconditioned HD you bought was faulty (unlikely but possible). More likely is when you installed the reconditioned HD, something else changes (e.g. connection made better contact) that caused the HD to show.
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