[CentOS] DPMS

I'm having a problem with my monitor not turning off after the 
screensaver times out or, after the set time for the monitor to leave 
suspend and then off.  I have checked, and +dpms is set with correct 
values.  Xscreensaver is set also in advanced to turn off after 30 
minutes.  Have tried other times, but still does not work.  ACPI in bios 
IS disabled, but I've never had to use that before to turn the monitor off.

Suggestions?

-- 
Snowman