my MacBook arrived this morning, I have it set up with my Dell 2405 and run it with it's lid closed. My questions are. Does anyone else run it closed? is this safe? the instructions say I can, just don't want anything to burn. Secondly, if you own a macbook, or any laptop really, when it's set up on your desk and hooked up to the power outlet, do you leave the battery in or run it without? thanks.