How can I now what's broken in my Creative ZEN vision M?

My ZVM 60 GB (mp3 player) stopped working 2 years ago, I didn't touch it since then.

What happened then was that while using (very often when switching songs) it stopped responding and I needed to restart it, or it shouted down while using it- slowly more and more often until it stopped working, (it usually had trouble finalizing after restarting).

Now when I connect it to the charger the blue light goes on, but this happens also when the battery is not connected,

How can I know if the only thing I need to do is to get a new hard drive, and I don't need a new battery or anything else? (is there a way to check the hard drive- connecting to computer etc.?)

Thank you (i'm new in this website- it's a great thing!)