I have an issue with my macbook. When the temp gets below 60 degrees (environment temperature not temperature of my macbook), my macbook freezes up. When I restart it, the macbook beeps at me (three long beeps and then starts over again) and wont start until it gets warm again. We took it into Mac support and they replaced my hard drive. This didn't change anything. Can someone give me suggestions on how or what this could be?