High Pitched Microphone sound

My laptop - ASUS K501L - produces a high pitched whistling sound, as well as other background static noises, when I use Skype. However, the problem is not present on other platforms, such as Google Hangouts and Line. I have tried manually adjusting the mic volume, but this does not fix the issue, and moreover it does not seem to change the volume of sound the receiving party hears. Plugging in earphones to eliminate audio feedback also does not work, but muting my mic stops the static the other end hears.
Thus, I have determined it is a problem with Skype, but I can't find any way to fix this. Help?
Thanks!

Hey, great suggestion Burn. It prompted me to look at iChat preferences, since that was the only application that I've had open which might engage the internal microphone.
Within iChat Preferences, I clicked on the 'Video' icon, and for the 'Microphone' setting I saw that 'None selected' (or something like that - that option has gone now?) was in place. So I changed the setting to Internal Microphone. The whistle or screech was still there. Then I changed the setting to 'Line In'. No more screech!!
A good result, but is this the way it's supposed to be? Does having the setting as 'Line In' mean that I have to plug headphones in whenever I want to use iChat for internet telephony? Unless I manually change to Internal Microphone, but then I suffer screeching again?
Cheers, Steven

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