Hi friends - I am a new Mac guy so please help me on this. I keep my Macbook in sleep mode most of the time. It wakes up almost all the time but some time it does not wake up from the sleep at all. I hit any keys randomly, I open and close screen etc but it does not work. Eventually, I use Power button to switch it off and then switch it on. Now is this a common problem or some serious issue. Is there any other way to wake up my Macbook (using some key combination) etc. Thanks in advance. By the way I have 2.4 Ghz new aluminium Macbook.