How to turn off PSM (power-saving mode) on SX2210?

Hi,

I just bought an SX2210, which I've connected through DVI to a Mac Pro tower. I love this monitor! But I'd like to be able to turn off the power-saving mode so I can let my screensaver run.

I don't see any PSM options in within SX2210's on-screen menu using the buttons along the right-hand side.

Any help would be greatly appreciated!

Thanks