Why my Bluetooth isn't turn on.

If the Bluetooth on a Dell Latitude 3570 will not turn on, here are the main things to check:

1. Verify hardware – Not every Latitude 3570 shipped with Bluetooth. Open Device Manager and look under “Bluetooth” or “Network adapters.” If nothing shows, the laptop may not have Bluetooth, or the driver may be missing.
2. BIOS setting – Restart the laptop, press F2 to enter BIOS, and under Wireless, make sure Bluetooth is enabled.
3. Wireless key – Some models use Fn + F2 (or a key with a radio icon) to toggle Wi-Fi and Bluetooth on/off. Make sure it’s enabled.
4. Drivers – Go to Dell’s support page for the Latitude 3570, download the latest Bluetooth driver for your Windows version, and install it. If a driver is already installed, try uninstalling it in Device Manager and reinstalling.
5. Windows settings – In Windows, go to Settings → Devices → Bluetooth & devices. If the toggle switch is missing, Windows doesn’t detect the adapter. If the toggle is there but won’t switch on, it’s usually a driver issue.
6. Hardware fault – Bluetooth on this model is built into the Wi-Fi card. If the card has failed, replacing the Wi-Fi/Bluetooth card usually restores Bluetooth.