ok well firstly im a girl but am right well when that started happening with mine firstly i was told by the shop that dirt or grease could of got on the laser and thats y it mite not be reading so i got the stuff to clean it and still no good so then because it was just over the yr old the shop would not exchange instead they gave me a number for sony who then talked me tru reformatting the ps3 which still didnt work..So by this time i was raging with the guarantee out and no proof of purchase as clever me lost the receipt i taught i was rightly screwed and would have to buy a new one but when talking to the guys at sony they explained to me that there was a fault in some of them and that they would pick it up and deliver me a new one...so all was good in the end..
Can get you the no. if needed...