Glad to hear you're sorted and I'm also glad that my thoughts on this were correct as I hate to see people replacing things unnecessarily.
Sometimes it has to be done though.
BTW: It is good to know that the disk can play fine on the TV DVD Player and still be a bad disc that won't copy. I don't understand it, but I'm now a confirmed believer:)
This is something I tell people all the time but many are reluctant to believe it.
An invisible flaw can interfere with the laser if it happens to be in exactly the wrong place or orientation in relation to the data.
I also had one brand new unplayed disc that wouldn't rip and had no visible marks, dust or damage.
When I cleaned the disc lightly it ripped properly, so even microscopic dust can interfere with the laser if it's in the wrong place.
A lot of people have never come across these difficulties themselves but I've ripped a few thousand discs in my time and have therefore experienced just about every problem that can happen.