High Capacity Sansa Players?

I have an 80gb Sansa player onto which I loaded a ton of classical music that I had bought. I tucked it away for a couple of years and today rediscovered it and wanted to start listening to my music. The only problem is that I can’t seem to turn it on. (I do have it connected to a usb port on my laptop.) Nor can I find an instruction manual at home or online. Nor can I find any information on this 80gb MP3 player on any SanDisk or Sansa website. Does anyone know where I can find instructions for using this player (which I think cost me about $175 a couple of years ago).