I could go to dell.com and see if your machine has bluetooth. What you noted is on all machines even if they didn't come with bluetooth. It confused a few.
I have a Dell Inspiron 6000. That little bar right above the F4, F5, F6 keys have 5 light up indicators that are (from left to right) Caps key, Num Lock key, scroll lock, WiFi, and there is one that is on the far right that I think is bluetooth. How do you light it up?