If the error occurs again, I would say it is a RAM problem. I used to have BSODs (Sometimes with info, sometimes just blue and no info) with looping sound. I played around with the RAM sticks, and found which one was faulty. No more BSODs now (Not my G73, but an old Asus). The service centers were unable to pickup the faulty RAM and sent it back with the problems still existing. Do a memtest, although the faulty RAM for mine wasn't able to be noticed (According to ASUS technician, who said that he did a memtest on the warranty paper).