Well, I got through to the telephone Yamaha CD tech troubles hotline and described my problems (!) and the guy there said it difficult to say whether this is a software or hardware problem because there are so many things it could be. He advised me to email the returns department that I had been given the details of which I did, waffling on again about my problems. You are asked to give your model number, serial number, purchase date, failure, full address and phone number. email@example.com
The next day I was sent a file which was giving me instructions that when the replacement drive arrives, I am to send them my faulty one within 10 days! Well, I didn't expect that. It says there is no charge, also. Seems to be under warranty which I am most surprised, but happy about. So I presume that the replacement drive is on it's way. I emailed back in disbelief asking them to confirm that this was the case, but I guess it got there after their offices closed on Friday night.
So I will let you guys know if it arrives, if it works and how the whole thing progresses.
Thanks again for all your help with my problems. Your efforts are appreciated.