How can I get my iMac to not go to sleep, but also black out the screen?

I want to leave my iMac on during the night, however when I sleep the display it ends up (after a couple of hours) completely going to sleep and an AppleScript won't work. Is there a way to make the screen go black but keep the computer on?
I've got energy savers preferences to never sleep the computer and never put the hard drives to sleep, and when I press control + option + eject I sleep the screen, but AppleScript's won't work...

You can just set a hot corner to black the screen and it won't go to sleep.
Ensure the sleep slider is at never.
Go to System Preferences, and click "Exposé & Spaces"
Go to the "Exposé" Tab, you will see "Active Screen Corners"
Change one to "Sleep Display" So when you put your cursor to the corner and leave it there (don't touch it or it will come back to a normal screen) it will be black but won't sleep!
This is what I have set on my iMac, hope it helps! It's my first answer post

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