Hi, I hope someone can help me to fix this problem. This morning, I used the laptop and it was fine. Then I put it in sleep mode. I came back later in the evening and pressed spacebar to wake it up but it won't wake up. I can see the light shining (the tiny light where the bar is to open the laptop) and when I tried to reboot it by pressing the power button, I can feel the vibrations but nothing comes up (no grey screen with apple icon clocking like you always see when it starts up/boots up). What can I do to fix this? I think the laptop is late 2007 or 2008, not sure and it has 3 GB RAM and plenty HDD memory. I hope laptop can be saved. Thanks!