Here is what you are going to do...
First, do not panic or be angry because your computer might end up something like in this picture.
|Monitor Power Cable|
|Monitor Signal Cable|
Second, think of why your computer has no display. Maybe it's only just the Power cable of the monitor not plugged into the socket, or the Signal cable not plugged into the VGA Port of your computer. Or maybe. your Monitor is really broken.
Remember, we only targeted the three main possible reasons why your computer doesn't have a display in it. Look in my Troubleshooting guide for some other tips that will also help you to Identify some other problems about faulty hardware.