How to turn screen off during disk erasure using Disk Utility?

I am trying to reset my iMac to factory setting -- ie: brand new. I have restarted my iMac using the Installation disc, and then once the iMac has started using this disc, I don't start the installation process, but rather start Disk Utility to erase the disk.
The problem is that the erasure of the disk is a rather lengthly process, and the screen never goes off! I am worried that this might damage the screen, with it being left on for long periods of time with the same image on it -- could burn the image into the actual screen like you sometimes see on flatscreen TV's. Is there any way that I can dim the screen, or, even better, get the screen to go off until I move the mouse again?
Thanks!
Message was edited by: Tatham

are you doing secure erasure? the erasure process is quite fast otherwise. there is no way to turn off the display but nothing will happen to it in such a short time. if you are still worried and have access to another Mac try the following. boot your computer in target mode, connect it to the other mac and erase the disk from there. the screen will display the firewire floating target mode icon. it's not bright at all and it's moving. finally, you can put both screens to sleep from the other computer by entering commandoptioneject. Unfortunately this shortcut doesn't work when you are booted from the install DVD.

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How to turn screen off during disk erasure using Disk Utility?

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