My playstation 3 won't start up anymore

I got home from school this afternoon and went to start my Ps3 and it comes up with the red power off button, and i can turn it on, but only for a few moments and than the YLOD comes and it beeps at me for 2 seconds and than the light starts flashing red. I know i haven't mistreated it in anyway, other than maybe over using it or leaving it on for to long. I'm also really annoyed because my BO2 disc is in there and i can't turn it on long enough for the disc to eject out.