Thank you for your comprehensible reply. My son has DW & TTP. Should he reset the PRAM first and then DW & or TTP?
You have already ruled out Resetting the NVRAM or PRAM
as a solution when you…
I plugged it into my hub and like on his desktop, it didn't show on mine either. I checked dick utility and it wasn't there. I then connected it directly into the back of my computer and it still didn't appear.
I then gave it a few sharp knocks but to no avail. I know how to dismantle it but my question is, do I need a special instrument to test it?
Is there anything else I could do before opening it?
A few sharp knocks would be more likely to cause irreparable physical damage than fixing
anything. Forty years ago with some of the very early HDs the motors were sometimes too weak to spin the drive up to speed and we would reach in and give them a start with a thin bladed screwdriver to break the sticktion
but a "sharp knock" is more likely to cause a head crash — which is by definition fatal.
Just how do you use those apps if the drive doesn't show on the desktop?
Until you can establish communications with the drive there is no way to run any diagnostic or repair software.
I'll suggest, then, that you swap out the LaCie's cable for a know good one, and if the problem turns out to be other than the cable, open the LaCie and swap out the 2 TB HD for a known good drive to determine whether it's the drive or the enclosure that's at fault. (I hope your son's data is backed up.)
And if Artie's suggestion indicates the drive is the issue and the data on the drive is worth several hundred dollars to your son, then Drive Savers
can probably recover the data to a new drive.