I have trouble with my computer accepting an audio CD for I Tunes to download. It remains in the computer for about 10- 15 seconds and then spits it out again. Why???

I have trouble with my computer accepting an audio CD that I want to download to ITunes. It will remain in the computer for 10 - 15 seconds before ejecting it and not allowing me to download. My ITunes is open. Why does this happen or what am I doing wrong? I have done this dozens of times before. What makes this different and does it have anything to do with recent upgrades?