I am very new at Arduino guys. Basically, what I'm trying to do is turn on an LED light if the arduino and PC are paired.
We're a page into the discussion before you mention 'pairing'.
Can you describe in detail how the PC and Arduino are connected, and what you want the Arduino to do? It sounds almost as if you want to set up a loopback at the PC between the Arduino USB COM port and a Bluetooth COM port so that you can send characters over Bluetooth and receive them back over the USB connection, and use that to detect whether the Bluetooth part of the link is connected. But this is only a wild guess, and I can't imagine how that would achieve anything useful.