If your computer monitor doesn't turn on when your computer is on, you may want to check your connections. Make sure your monitor is on, and that the cable connecting your computer and the monitor is...
If it's the magnifying glass on widows vista and you have a Microsoft mouse all you have to do is press the small little button on the left side. If not try looking around in the control panel.
No, you cannot, because the one monitor only has enough ports for the wires of one computer. By itself, no you can't. You need what is called a KVM (Keyboard, Video, Monitor) switch, and the...