Gaming Consoles have a manufacturer warranty of 12 months. After the first 30 days, you have to contact the manufacturer direct. The retail outlets cannot do anything after 30 days.
80GB PS3 have a 'software' emulation for old PS2 games, suppose to be backward compatible. There is a 60GB version out on the market, have the actual hardware chip of the PS2, which is 100% backward compatible.