Symptoms: It will suddenly freeze on me, whether I do simple tasks or have multiple things going on at the same time. At this point I HAVE to manually restart it via the power button since the screen is completely frozen. Other times the computer just acts very slowly (this has all happened maybe 5 times in the past 2 weeks). Yesterday, it froze on me 2 consecutive times, and as it restarted and was at the "Apple" logo with the icon that goes round and round below the logo, the logo froze and it never went to the screen where I enter my password. It kept reaching that point repeatedly, and after a good nights sleep it got past that point. What does this all mean? I'm assuming some sort of harddrive problem, but do these symptoms signify that I need a new harddrive eventually, or that I can clean up my harddrive or even there's maybe a virus on my MBP?