Help ps3 yellow light of death?

Well yesterday i got my ylod ps3 from ebay i thought i could fix it cause my xbox got rrod Lol and well.. its alot harder than i thought. We did the heatgun thing maybe 3-4 times now and on the 4th time i put it together and like it went ylod maybe 4 times but.. i pushed down like on the power and it flashed blue! so now im wondering if its something else? any ideas this is my first ps3 so idk much about them and im going to try putting flux on the chips.. so any ideas? thanks