Ok heres a small history on my hardrive(s): I got the laptop in the summer, and it worked flawlessly. When I moved to my Dad's I was playing WoW in a pretty hot room (you would break a sweat, but I did have the fan on [me not the laptop usually]), and my mac kept shutting down. It was ok for simple apps, but WoW really overloaded it frequently. Eventually, maybe first week of september my hard drive totally failed, so I took it to and they replaced the hard-drive. Current Issue: Now I am in a basement room, and it is frequentl really cold down here when i turn off the space-heater (or else it gets way too hot under my blankets). We had a power outage that lasted a few days during a huge NE US blizzard.. I turned my laptop on (keep in mind it is REALLY cold in my room), and the hard-drive made this really loud clicking noise.. this eventually subdued as I used the laptop (it warmed up?)... but ever since my laptop makes a clicking noise (it also has a low hum/low-rapid click noise when i use it)... My laptop is often taken out of a cold environmnet, (sitting in my car during my art class + 1 hour then for my other classes) and when I initially take out my laptop the aluminum casing is COLD. Question: Did the extreme cold cause this? Is the frequent contact with chill temperatures causing this? And should I be concerned/ get a new HD?