What screensaver are you trying to use, how did you configure it, and are you sure it's running?  Open a terminal and run this:

ps aux | grep screensaver

You should get two lines in response: one listing your screensaver, and one listing grep itself.  If you only get the second line, your screensaver isn't running.

Thanks Sideburns, yes the screensaver is running "gnome-screensaver"

j

ps aux | grep screensaver

You should get two lines in response: one listing your screensaver, and one listing grep itself.  If you only get the second line, your screensaver isn't running.

I installed xfce on Centos 6, the screen save is configurated to take action in 3 minutes idel and password access, but the screen save has never happend, even hours idel, it was still no screen save. What could be wrong?

Thank you.

J