There are only three possibilities if the drive is connected with the standard IDE plug (the big one on a flat cable):
1. Master
2. Slave
3. Cable select [this selects Master or Slave depending on which plug of the 'Y' cable is connected to the drive in a PC]
So looked at logically: you already know Slave is wrong: if you used Cable Select it couldn't select slave as you know that is impossible.
So it must be Master.
But if you have tried Master and that doesn't work, there must be something else going on. Are you sure the plug is fully home?
Try this site
http://www.samsung.com/Products/HardDiskDrive/index.htm
the user guides show jumper options.
It is possible that the connection is SATA (small round cable) in which case the jumpers are not relevant and the plug should usually be set to a 'store' position.
If the HDD shares a 'Y' cable with the DVD drive, you could check the DVD jumper setting and the HDD must be the 'other' one.
I wonder if during the HDD's temporary residence in the PC something was written to it by the PC? You could take a chance and do a full format of the problem drive on a PC, without creating a boot sector.
If you are totally unable to fix it, it is possible that buying a new (totally identical) drive around £50 probably, and fitting that would fix the problem and be cheaper than a repair bill. The E85 would get a 'virgin' HDD and might then proceed to format it correctly.
If you contact Panasonic you don't have to say what you did - claim you are replacing a faulty drive and (stupidly) disturbed the jumper.
At least you know whom to bill for the repair if you can't fix it.
