Must be one of those pay-per-play machines, in which you have to insert a quarter into the fan/vent before it will allow access to the disk slot. Sometimes you can get around this by holding the controller high above your head and doing the hokey pokey exactly 8.6 feet away from the TV (not the console). If that doesn't work, you might also try lulling the system into a false sense of security by singing Barry Maniliow's Copacabana, while smiling as widely as you can during the brief pauses. Make absolutely sure though, that you don't mess up the words, otherwise you'll make the system angry, and the price for disk access goes up to $10. At this point, you'll just have to pay the $10 dollars, because it you try to bribe the machine anymore, it will start to smoke eventually bursting into flames, thus melting the machine and destroying any nearby furniture.
The bottom line here is this: PS3 beats Xbox every time.