Internal microphone not working properly

Sins i bought my HP Pavilion dv7-7051ea one month ago the internal microphone never worked properly when i try to talk to my friends on Skype or voipwise.I've reinstold  the  mic driver-didn't help.Adjusting the mic settings on control panel didn't help aither.Anibody , please help me to solve the problem.
George
This question was solved.
View Solution.

Try the steps listed in this document from HP. It has the most common solutions and steps to isolate the issue.
It is possibly a hardware issue since an external microphone works without any issue, but let me know what happens with each step of the document as that will help determine if it is a hardware issue or not.
Also, let me know the results of the steps in the Using Windows Sound Recorder to test the microphone section. If this recorded file also exhibits the same behavior, then it is definitely not any third party software causing the issue.
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