Hi everyone, and thanks in advance for any advice you can give. My brother in law gave me his old MacBook (I'm not sure what the processor is, but it has 2GB of RAM) for Christmas. It was working perfectly fine that day, and I took it home and started to install OSX Leopard. That's when the trouble started... As you can see in this video: http://www.youtube.com/watch?v=F4X2AB_hENo It keeps going to sleep every few seconds. If I wait a moment and hit any button, it activates again...then goes right back to sleep. I'm normally a PC user, so I've only been able to try a couple of things I've seen on the board here, including: Disconnecting the power chord and holding the power button for 5 seconds. Rebooting the computer while holding down Command-Option-P-R Any suggestions? Thanks much!