Audio Listening Only From Headphone Not In Laptop Speakers

1. Play some music from your music file, now put jack of your headphone or speaker, you will hear the music playing;

2. Now pull out the jack, no sound will heard on speaker of your computer;

3. Now, keep repeating step 1 and 2 - put the jack and pull it out for sometimes may be 10 to 20 times, ultimately sound will be heard on your computer's speaker.

I have personally exprienced this problem frequently whenever I used external speaker or headphone, but I resolved it in the same way for many times.

I do not see it as a software problems, I don't know exactly, but it may be because of jack pin after prolong use, it may not be able to unlock some circuital elements in sound output terminal when take it out normally.