Actually, I'm getting somewhere with this now. I found a post on this forum from a year or two ago whereby a user created a boot disk using syslinux v2.08 (downloadable free from syslinux.org), all you do is open a command prompt and navigate to a folder where you extracted the syslinux download and type the following command:- syslinux.exe -s a:
Just make sure you use the older version 2.08 as new versions won't work.
This will write the boot sector to your floppy disk. Next, copy the floppy files to the disk from the Yamaha download ftp. It will stop on one of the files as it already exists, choose to skip this file.
This has then created a working boot disk for the Yamaha and it has solved my problems.
I'm still having issues writing the files to the new HDD however. I think this is a compatibility issue with the ide to Sata board I purchased so have ordered a different type from Amazon. Hopefully I will have a working piano when that arrives!
Sion