Monitor/Computer won't come on?

I have an iMac (self contained) computer. Yesterday I moved the iMac to another room, the computer worked fien, but I decided to move it back to its original location. I didn't plug it back in last night ... I waited until this morning to plug it in and turn it on. But when I did, the monitor wouldn't come on. The little pulsing white light (i.e. the heartbeat) in the bottom right corner pulses, but the monitor itself won't come on. It doesn't do anything ... it just stays black. It there something I can do?
Help! Thanks!

Which "model" & "generation" G5 iMac do you have?
Need this info so that the knowledgeable users can provide you with the proper troubleshooting solution(s).
http://docs.info.apple.com/article.html?artnum=301724-en How to identify your iMac
http://docs.info.apple.com/article.html?path=Mac/10.4/en/mh355.html Getting information about your computer
You can have this info displayed on the bottom of every post by going to 'My Settings' which is located in the column on the right under your name, and filling in the information asked for.
Thank you
In the meantime, see KB Article: http://docs.info.apple.com/article.html?artnum=301283 Troubleshooting when there's no picture on the display

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Monitor/Computer won't come on?

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