Answer to: MBP won't turn on/boot upI would check your RAM. When the light on the front blinks it sometimes means your RAM modules aren't seated properly. Take out the RAM cards (make sure to wear a static wrist strap or touch something metal that is grounded before you touch the RAM! Electrostatic discharge will kill your RAM). They are located next to your battery. Here's instructions on how to do this: MacBook Pro 17" Models A1151 A1212 A1229 and A1261 RAM Replacement Make sure the RAM cards are clean and then put them back in properly. I hope that is all that's wrong! -LT
Answer to: Headphone jack isn't working. how do I replace it?That's a pretty easy fix. You need to replace the audio board. Here's the link: Mac mini Model A1176 Audio Board Replacement
Answer to: Trackpad replacement - Which is the right part number?I'm pretty sure either part number will work. There are any number of parts for the Macbook Pro line that have multiple part numbers.