Loud clang and now the top won't go up/down?

[lurky]

Hello,

I have 2007 Boxster and I live in the North East.
I put the top down at a stop light and when it was almost all the way down I heard a loud clang, kind of behind me and on the passenger side.
Later, I pressed the switch to put the top back up, and the rag top only moved a few inches then stopped. The metal cover piece that lifts up and down seems to be moving fine, but I had to grab the ragtop and pull it back in place by hand.
So if I were to guess, I'd guess that the loud clang was a cable or belt snapping, and with that belt broken the top won't move.
Does someone here know about the mechanism that operates the top, and does my guess sound correct? IF so, is this something I can fix myself?

Thanks!