I had my DSL Ethernet modem connected to my MacBook Pro (15" MB470LL/A). There was a sudden bang and a lightning later, my modem burst. At the same time I noticed a spark at the ethernet port on the laptop. I didn't bother much and bought a new modem. Now, the port isn't working! The modem's ethernet light lights up when connected to any other computer except this one. What are the possible components that could have failed and would I be able to replace them myself? I don't have a lot of technical know-how and the max I have done so far is upgrade the RAM. Thanks!