Here on all the Apples I've used skype works with the internal mic just fine. Hope it's under applecare.
Since a mic outputs so little signal, ask around for one of those USB mics. Something like this -> http://www.amazon.com/Blue-Microphones-Yeti-USB-Microphone/dp/B002VA464S
I see Apple in the pictures too.
I am so frustrated. I have had this desktop Mac OS X 10.5.8 for going on five years now. I have tried a number of times over the years to do certain things like record things or use skype. I try and then give up in frustration. Now that my son is leaving for an extended stay in Germany I am back to trying to make skype work.
The test call on skype it tells me my microphone is on mute. When I go into *system preferences and *sound and *input and *built in microphone, the bar that shows the sound bar by bar flickers when I yell.
Please, I hope someone can help with this!
Thanks in advance,