There is a thing called the green light of death and here's how I fixed mine
First flip your PS3 over there will be screws unscrew them then there is a black tab on one of them lift it up and unscrew that . In the front of it there will be black screws then you need to go to lows and ask for a t10 star torch (type of screwdriver head cheap) then once u get that then unscrew them then take off the lid and then clean your PS3 put screw the lid back on . I hope u get your PS3 running sagamore and good luck with it