I bought these dvd-r's http://www.shop4tech.com/item2423.html and my PB G4 15 Superdrive wont recognize em. Funny thing is it did recognize the first dvdr i put in fromt the SAME batch, but a day later i try and it doesnt even recognize it. It just makes sounds for a minute then, like, gives up. Im thinking of returning the dvd's but id rather not pay S&H so if there is another solution... HELP!!!! Thanks to all.