I would like to help you here, please elaborate as to what is the problem you are facing with the headphones. You have mentioned that you did what was suggested so please add the link to the thread you are following, this will help in isolating the problem.
Try the below mentioned steps and check if you can hear sound from the headphones:
1. Run the Windows Audio Playback Daignose and Repair from this MS Fix it 2. Check the Audio Jacks and audio cables for damage.
3. Check for Hardware or Software Configuration Changes (Audio Properties in Windows).
4. Download and Install the Latest Audio Drivers from the audio Card's/Motherboard's manufacturer's website.
5. Test another known good head phones or external speakers. If passes, Replace the headphones.