Headphones not working in HP laptop

I have a HP Pavilion dv4-1101tu notebook. Currently it is running on Windows 7. All devices are installed correctly with their driver softwares.

When I make a call over Skype with my headphone plugged in, the call's sound goes through this headphone. But the weird thing is that if I open an audio file at the same time, the audio's sound will goes through the speaker. So I have tried to:

  • Change Windows default playback device to Independent headphones: Nothing happened. Also Windows default communication device can only be set to Speakers and Headphones.
  • Change Skype's audio setting to Independent headphones: Both call's and audio's sound will go through the speaker. The default setting is Speakers and Headphones.
  • Change settings in IDT Audio Control Panel: This panel does not allow me to change default playback device to my headphone.
  • Disable the speaker: No audio's sound anymore.

My playback settings look like this

Headphones not working in HP laptop

Can anybody help me please?