How to force the display to sleep, while keeping the computer running?

I'm running some compression and transcoding programs on my iMac G5 (iSight) that keeps the CPU at 100% for hours at a time. My Energy Saver prefernces is set to sleep the display after a few minutes, but never to sleep the computer or the hard disk.
Like I'd expect with such a high CPU load, my computer's screen does not go to sleep.
Is there a program or command line utility that I can run to force my screen to go to sleep, but keep the computer running?
iMac G5 17" (iSight) Mac OS X (10.4.5)

To put your display only to sleep;
Go to System Preferences, click on 'energy saver', check the 'Put the display to sleep when the computer is inactive for' box, and then set the time. Note; this just puts the display to sleep, not the whole computer. Your hard disk will keep running. I find this much more convienent than putting the computer in 'full sheep'. It wakes up much quicker without some of the hassle some computers display coming up from full sleep.

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