I got the YLOD and managed to fix my PS3 using these videos
I made a thread about it here (A lot of the images are missing and I'm not sure why)
Anyway its not really a permanant fix, but it did turn my PS3 on and I got my disc out and did a full HDD reformat. You'll need a heat gun and thermal paste.
EDIT: Mine was a launch 60 gig fatty, not sure if the videos apply to the slims
Platinums: Red Dead Redemption, Killzone 2, LittleBigPlanet, Terminator Salvation, Uncharted 1, inFamous Second Son, Rocket League