Apple loops audio files wont play

Question

I can listen to previews of the loops but when I drag them to the arrange area, I hear nothing. I can see that they are working but cant hear anything. The green instrument apple loops work fine, its only the blue ones that dont work. I also cant hear anything that has been recorded using a usb mic. I have everything set up the way the manual tells me too, and it will record and I can see that it is playing i just cant hear it. How do I fix this problem. I have Logic Pro 9 and Snow Leopard.

Answer 1

I have not changed any settings on my own as I am very new to the whole music recording thing and have no idea how to get technical. All I have done is installed the program and followed the "try this" in the getting started manual. It seemed to work just fine the first time I put something together. I restarted my computer because it was seeming extraordinarily slow. When I reopened logic and attempted to create another beat only the green loops could be heard. Although you could see the meters moving on the blue ones no sound could be heard through either the built in speakers or headphones as I tried both. I can still click on the blue loops while they are in the loops library and I hear them just fine. As soon as they are dragged into the arrange area, I hear nothing.