Windows 7 - Sound coming from speakers when headphones attached

Hi,

I have the following problem with Dell Inspiron N5010 with Windows 7 Ultimate 64 Bit: When headphones are connected to the headphone jack, the laptop speakers will not disable.

The laptop recognizes headphones (test sounds are coming through) and they can be used for communications, e.g. Skype. The laptop has IDT High Definition Audio CODEC driver's latest version.

On the other hand, sound from softwares and games are coming from the speaker.

According to me, the problem would be that it is not possible to switch headphones as default device in control panel -> sound.
See the Attached pic, even if i click "Default Device" for headphones it does nothing, there is no tickmark even after clicking
Pls Help!

Apparently, This problem was caused after my motherboard and heatsink were replaced by dell service guy due to overheating.

Control Panel | in the box, top, right which says Search Control Panel, type troubleshooting | Under Troubleshooting, Find and fix problems | Hardware and Sound | you will have Playing audio and Recording audio.

Let me know if this solved your problem.

Although it identified that the problem is "Audio device is not set as Default" but it was unable to fix it !

I'm going thru various stuff I've saved. Let's see what I can find. You'll have to see if any really help.

No sound in Windows

Diagnose and repair sound recording problems automatically

Im having the exact same problem. It is not the headphones. Has anybody found an answer to fix this???