look very close at the power light when you
red-green-YELLOW-flashing red
that would be the YLoD
i had the happen to me with FFXIII in the system (phat 60gb)
had to send it to Sony for a $$$$ fix
they sent a different ps3 back (HDD FORMATED)
and the disc
and that PS3 ALSO got the YLoD
you might need to OPEN the system
to get the disc out