How to keep my display from dimming

I use my imac as a tv, but the display dims after about 5 min of no activity. How can I make it so it never dims?

Hello,
Thanks for the tips everyone
You're welcome
I found the check boxes in energy saver. . .I had the
"automatically reduce the brightness before sleep"
Box unchecked, but it still continues to dim after a
few minues of sitting there. I know this sholdn't be
as complicated as it has been. Is it pissible there
is a "glitch" in my system?
A little bit of research indicates that this is a bug in OS 10.4.x.
You might find this discussion interesting or helpful:
http://forums.macrumors.com/archive/index.php/t-213542.html
And, then there's a Terminal trick mentioned here:
http://forums.macnn.com/58/imac-emac-and-mac-mini/308169/dimming-confusion/
Terminal is basically the Command Line interface to OS X's underlying Unix shell. You can find it in the Applications --> Utilities folder.
You can enter the command they mention directly at the prompt.
If you are up to tinkering, you could probably put together an Automator routine / workflow that you could activate more conveniently to run this command.
Or, a similar thing could be done with AppleScript.
Another idea you might try is disabling all power management settings (like sleep, etc.). And, see what happens. Perhaps that would lock it in. You could then sleep by pressing the power button one time quickly.
I hope this helps.
Let us know if you have other questions.
P.S., if you'd like, go ahead and click the "Helpful" or "Solved" buttons on any of the posts / replies above if you feel they were helpful or adequately answered your question.

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