There's no audio coming from my headphones

Check the condition of the audio cable. If the plug or any part of the cable has been damaged, that could be causing the problem
Make sure the headphones are connected properly. The headphones may be connected improperly or the connection may have come loose. Remove and reseat the headphone connector
Make sure the audio device is on and the volume is turned up
Try a different audio device. The problem could be with the audio device to which your headphones are currently connected