I am a new Mac user. I have MacBook that is running OX 10.0.5 (Tiger?), and I was playing around with the start up options while running my Mac. Now the computer only starts up in Windows, and I can't figure out how to get out of WIndows and back to the Mac side, which is where I want to be! I'm sure this is a basic question, but I'd welcome any help folks could offer!