IMac monitor has stopped working

On boot up/bringing the system out of sleep the monitor flashes for a second, if it's coming out of sleep I can see the desktop/any windows currently open before it dies.
Currently I'm using an external monitor which works fine however it's still annoying to have a dead monitor.
Any ideas would be appreciated.

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You provided no system or OS information. In order for the knowledgeable users to provide you with correct troubleshooting suggestions, please fill out the *My Settings* option which is in the right column--->
Which model/generation iMac do you have? There are 3 models/generation of G5 iMacs.
http://docs.info.apple.com/article.html?artnum=301724-en How to identify your iMac
What have you already done to troubleshoot? Need this information to avoid the +"been there, done that"+ scenario when the users here try to help you.
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