It's been the same problem for a while now on my desktop. Everytime I plugged something in the microphone jack a message pops up saying, it was unplugged. Now I may have an idea behind why it does this, I used to use Camstudio and it recorded sound through the speakers and I have used it on my laptop which has a built in microphone however it recorded from the microphone rather from the speakers. This is really bugging me cause I can't use my mic for Skype and some of my games that can allow me to use a mic. Oh and my operating system is Windows XP.
Appreciate the help guys :]
Appreciate the help guys :]