If I launch Steam my 2009 MBP just freezes. Just 2 days ago it worked like a gem and since then no damage has been done to the laptop. No fluid, no physical contact, I haven't even moved it from the desk. As I said, everything else works beautifully. What can I do? I already checked the hard drive with CMD+R -> showed no damage. Also, I tried reinstalling Steam but it did me no good, laptop freezes every time. I'm truly shocked, none of this make sense for me. What about you?