Thanks very much for the reply L.
I'm on Mac. Would this be a similar process on Mac?
I've located the wallet.dat file on the external hard drive in Users/Library/Application Support/Zen.
When I initially opened the wallet from the external hard drive the wallet took about 15 minutes to load but then the sync status says NaN% with 0 connections. There aren't any receive addresses and no history just like a new wallet. I'm afraid that if I try reinstalling the wallet that I'll do the wrong thing somewhere. I'm not very technical unfortunately.
Surely I must be able to get the coins back because as far as I know all the data was recovered and is sitting on my external.
I hope someone has had this problem before and is able to give me a step by step guide to recovering the coins.
Any help would be greatly appreciated as I've been pretty down after losing the coins. It's a lot of money for me.