I have had my MacBook Pro for almost 4 years. It has been a very reliable computer and I have gotten a lot of use out of it. Within the past few weeks, it has stopped responding to anything I do, and within 5 minutes of being turned on it gets EXTREMELY hot.. An acquaintance of mine who is extremely tech-savvy believes the motherboard or harddrive is the issue. I don't know what to do. I believe I may just have to buy a new laptop.. Any ideas?