Not all compaq 6720s come with bluetooth module, but you can go to Control Panel --> System --> Hardware --> Device Manager, check whether your laptop is bluetooth ready, refer picture below,
If you can see the Bluetooth Devices in Device Manager, means your laptop is bluetooth ready. Then on your bluetooth by click the wireless button and you willl see blue light is on.
Check this icon at the right bottom corner of your desktop,
If BWT is disabled (red logo), enable it by right-clicking the Bluetooth icon and selecting Start the Bluetooth Device. The logo will change from red to white. Then you can use the Bluetooth Setup wizard to configure the service and security features as follows:
1. Right-click the Bluetooth icon, and then select Explore My Bluetooth Places.
2. Right-click the My Bluetooth Places icon in the Folders pane of Windows
Explorer and select Bluetooth Setup Wizard to begin the configuration process.
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