Helllo guys. I bought a macbook pro 15 and through the first 15 days it was ok. Then, I installed an program with a dvd and after restarting the mac, it began to do a grinding noise on startup. The same noise that it would normally do when you insert any discs, it does on startup. I had a 2008 macbook pro and it didnt do such thing. The disc-check sound was very quietly. I've searched of the apple site for information and they tell that the way to stop this noise was by reseting the SMP or something like that OR inserting a disc almost to the end and then pull it back. However none of those worked and the noise is still there. I have seen other people with that, so I dont know if it's a characteristic of this superdrive's model or if there's really a hardware problem.. A friend bought a 13" the following week and the same this happened, but the macbook they had for exposition did not make that. Could it be a whole group of superdrives with defect?