Hello to all, As said in the title I have a PC. 2 years and 5 months after purchasing it: the sound card has gone crazy - its epicly slow and the screen is starting to go blue... So getting a new computer is on the list. Many of my friends have macs and they are all crazy in love about them: and I do understand why! Macs are great! But the bottom line stopping me to buy one is: If my macbook lasts more than 3 years: will it become obsolete? Because that's the case with PCs, you have to change them every 2/3 years but what about macs? Thank you for your time!