Seems like a lot of PS3s are suffering Blu Ray failures now they have actually got a game worth playing mopre than 10 mins so I recommend, DO NOT BUY GTAIV on the PS3 if you dont want the dreaded BRROD error....
http://www.amazon.co.uk/gp/forum/cd/discussion.html/ref=cm_cd_ef_tft_tp?ie=UTF8&cdForum=Fx3AJYVU1NCUW0N&asin=B000E6HH74&cdThread=Tx2B7T9I6REMQI7