Right click on the desktop choose Configure Desktop then Display option next Power Control tab then I usually change the Standby setting up one click then back down and click on the Apply button.
Or from a console: xset s on (for screensaver) xset +dpms (for power save) -- swk --To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]