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Reset the Bluetooth speaker
This is the best way to resolve bluetooth-pairing issues your bluetooth speaker might experience. By resetting your bluetooth speaker you will clear the list of paired devices, which might be responsible for this issue in the first place.
Most of the speakers can be reset if you press and hold the Mute button for at least 10 seconds and press the power button afterwards.
Note: If the above-mentioned instruction didn't work, consult your speaker's manual.
Make sure that the speaker is not connected to another device
Maybe the speaker is paired with another device you used it with before, because speakers connect to the devices which were last used with them. A speaker can only be connected to one device at a time.
Make sure that the other devices' Bluetooth is disabled and then try connecting your device to the Bluetooth speaker.
If you paired your bluetooth headset or speaker with your computer or mobile device, and everything goes smoothly but you can't hear any sound, check if you have accidentally activated the mute option. All you have to do is to unmute your device and you should be able to hear sounds coming out.
If you cannot pair your (smart)phone or tablet with another bluetooth-capable device (e.g. computer, tablet, bluetooth speaker/headphones, etc.) restart the mobile device. After it turns on, you should be able to pair it with another device, provided that its bluetooth feature works.
If you cannot pair your computer with another bluetooth-capable device (e.g. smartphone, tablet, bluetooth speaker/headphones, keyboard, etc.) restart the computer, after which you should be able to pair it.
If your device is powered by non-rechargeable batteries and you were unable to turn it on, consider replacing the batteries. To be 100% sure that the batteries need to be replaced, test them on another device which uses batteries of the same type.
Contact the device manufacturer's customer support
Maybe your device's bluetooth issue can be resolved easily by the manufacturer's customer support team. All you need to do is to call them and follow their instructions. Also, most of the manufacturers have a troubleshooting page on their websites, which can help you fix your device's bluetooth feature by yourself.
Bluetooth devices cannot communicate unless they are paired. In order to pair devices, you need to enable the Bluetooth feature on both of them. Then, go to the bluetooth menu of one of the devices and through it select the other device and tap on the "Pair" button. Then, follow the instructions you will be given.