I bought a 250 Gig hard drive from Tiger Direct and I was going to install it on my macbook pro. It came as a surprise to me that hard drives are only user-replaceable on regular macbooks. Anyway, I swapped out the drives using a guide on youtube, and to my horrible stomach-cramping dismay, the macbook pro did not want to start up when put back together. One thing that gives me a bit of hope is that the magsafe power adapter turns green when plugged in. is there anything that could be wrong with the laptop that could be less painful an more easily fixed than ESD? And if it is for sure broken, what can I do to fix it, in order from cheapest to most expensive?