Answer to "My 17 in MacBook Pro does`t turn on..."I had the same problem with my MacBook Pro. It is fairly common. You Tube it, there are plenty of videos. Mine started for 2 seconds and shutdown. An apparent mother board issue. If it is still under warranty send it in. If not, you have nothing to lose, so try this. I did this today and my MBP is now working like new again. http://russell.heistuman.com/2010/04/27/...-the-books-or-baking-my-macbook-pro-logic-board/ There are also plenty of videos on youtube that show exactly how it is done. It sounds kind of scary, but mine was no longer under warranty and I really had nothing to lose. One problem I did have is that I didn't seat the RAM back in properly after I put everything back together, so there was about a half an hour after I did this, that I didn't think it worked, but it did. It's kind of amazing, but makes sense if you think about what it is actually doing. softening the solder to close up the broken connections. Good Luck!
Answer to "Initial startup then shutdown"If you can't come to any other conclusion than the logic board, check out the links below. I have a macbook pro 15" that displays the characteristics they talk about. You can hear it start for about 2 seconds, than it shuts down with no boot up. I am going to try this tomorrow. You basically bake the logic board to "soften up" the solder connections that may have broken loose. Be sure to pay attention to the part about the thermal paste. Here is a blog with some good info: http://russell.heistuman.com/2010/04/27/...-the-books-or-baking-my-macbook-pro-logic-board/ There is also some good info on YouTube: http://www.youtube.com/watch?v=B5ivs6g0f... Visit ifixit.com for instructions on how to remove your logicboard. Good Luck