I think once Andy gets one, there will be more to follow, he has just got to get over that first hurdle.
I agree, the block is mental which affects his game. He has the talent - can he ever find the mental stability and consistancy? I don't know the answer to this and I haven't voted. With the first slam would come a different Andy, more confident, and more consistant and oh how I wish this for him as I know it is what he himself wants - or at least he has said so. Something has to change, whether Lendl will help him achieve it, I don't know. Good luck Andy, I will always be chering you on.