recently my computer has been ignoring audio cds. it registers a blank cd, and will even let me burn onto one (both as mp3s and audio files and then pictures and video etc. so like nothing was wrong), and it will load and read and play the cd if i reload it (after burning it). i also play dvds like nothing were wrong too. but when i put in a music disc, like one i buy at a record store, it spits it back out. it doesnt even load onto the desktop. this started shortly after i had ripped a promotional cd with a watermark on it - but that couldn't have anything to do with it could it? i also recently upgraded to the newest itunes but that wouldnt make sense either. i'm confused! help!