What do you mean by "power-save" mode really? Any of the presented options do not account for suspend or hibernation states. So, no cookie for you, pollster.

Now, if "monitor" or "screen" were inserted somewhere, i would choose something from the below depending on my own state of mind ...

• Moving the mouse around wildly
• Clicking one of the mouse buttons
• Pounding the keyboard
• Pressing the shift key
• Pressing the spacebar
• Pressing another key which I believe will not affect any open programs or windows
• Pressing any key, not caring if it affects any open programs or windows