Short-range & extra gadgets. Verify that the gadget is correctly linked with your Lenovo G510. Reboot your laptop and try pairing to the unit once more.
Disabling as well as Re-enabling Bluetooth Disabling and re-enabling Bluetooth might at times fix linking problems: lenovo g510 bluetooth not working
Go towards Unit Manager (Hit a Operating system button + X and also choose Device Manager). Expand that Bluetooth section. Select at the Bluetooth adapter and also select Disable device. Short-range & extra gadgets