You've probably already tried this, but maybe the lens is just dirty and
needs cleaning with one of the cleaning MDs you can buy in most shops?
Whatever the problem is, good luck! My second Sony discman did something
similar a few months ago -- when trying to play most CDs it would say "no
disc"
After a couple of years of good service my trusty AM-F5 seems to have packed
up. When you put a disc in it makes rhythmic clicking for a while, and never
quite manages to read the toc. Does that sound like my optical block has
come unaligned or something else.
Oh and on the other topic - i very