There's a tab that looks like it can opened above the HDD slot. Any idea of what that might be? Here are some pictures:
First two is of the "unknown" tab:
http://img171.imageshack.us/img171/8477/2po3.jpg
http://img209.imageshack.us/img209/773/3cw0.jpg
The rest (very dusty):
http://img82.imageshack.us/img82/9743/1zn5.jpg
http://img291.imageshack.us/img291/5337/4uz9.jpg
http://img431.imageshack.us/img431/4149/5nf6.jpg
http://img330.imageshack.us/img330/5849/6qc6.jpg
First two is of the "unknown" tab:
http://img171.imageshack.us/img171/8477/2po3.jpg
http://img209.imageshack.us/img209/773/3cw0.jpg
The rest (very dusty):
http://img82.imageshack.us/img82/9743/1zn5.jpg
http://img291.imageshack.us/img291/5337/4uz9.jpg
http://img431.imageshack.us/img431/4149/5nf6.jpg
http://img330.imageshack.us/img330/5849/6qc6.jpg