If you are getting an on-screen menu, you are probably not actually pushing the power button. The F22 has a 4 direction navigation bezel around the power button. It looks like part of the power button but is actually separate. To turn the monitor off, push the center of the button (where the blue light is), and not the silver ring around it.
"I did RC5, but I didn't flush." - Bill Clinton
"I invented distributed computing." - Al Gore
"I had a dream where every American would be free to run SETI@Home!" - Martin Luther King Jr.
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"I did not have BOINC relations with that woman, Rosetta@Home!" - Bill Clinton