I have a 2008 Mac book pro 15". I take it to the genius bar because it was shutting down suddenly. The first problem that I had was the ethernet port went out. I just brought a ethernet to USB port for 30 dollars instead of paying $ 310 to replace the port and the logic board. Now they are saying my hard drive is bad. It's going to cost 161.00 Is it a good idea to replace the had drive or should I wait until after the upgrade? My concern is a lot people are having a lot of problems with the new Mac book pros.