I have only had my MBP (very first mac) last 1/25 and for a few days would wake from sleep totally silent. In the last couple of days occasionally it wil make a creaking sound for a couple of seconds after I raise the lid sounds kinda like gears. Not very loud tho. But since this is a refurbished (june 2012) unit I was just wondering if this is normal. My old toshiba would always make creaky gear sounding noises at wake from sleep for much longer. But since it is silent it is silent most times I was wondering if this was normal or a known problem?