To the left of the trackpad you have the battery and near the trackpad you have the hdd (i believe). BACKUP YOUR FILES NOW!
Also, check the RAM (it's also near that area of the laptop). I am not familiar with the insides of that laptop, so I can't tell you exactly what's there, but that's what i believe is there.
Good luck!
EDIT: I think that's the hdd. so BACKUP!