Main menu inviting to take a tour on how to adjust the monitor keeps popping up uninvited.

See this... http://www.help2go.com/forum/computer-help/109000-osd-menu-pops-up-suddenly-monitor.html
and this... http://h30434.www3.hp.com/t5/Desktop-Audio-Video-Monitors/OSD-Menu-keeps-popping-up/td-p/340738
and this... https://uk.answers.yahoo.com/question/index?qid=20080531045826AAswEyb

Sounds like your menu button on the monitor is stuck in the pushed in position. See if that is the problem and use a needle, q-tip with alcohol to pop it back out.

http://support.gateway.com/s/Manuals/Monitors/8512088.pdf
See pages 16 and 17. You will want to get to the picture menu in order to adjust the brightness.

davea47, Your monitor's internal "switchmode-power-supply" is probably having a problem. You may need to do some electrolytic filter capacitor replacement!!! Problem not new one!! You or qualified lcd monitor technician will need to open unit for inspection/evaluation of power supply board. Do some reading in the fixya profiles of "budmrtn" "buddymc" "12fixlouie" (me) and follow links you find there. After investigating your unit let us tech's here at fixya know what you will do to repair unit. 12fixlouie

Main menu button on OS buttons is stuck,

Contact Dell Techncial support for repalcement Monitor

csofhaus, First place (thing) I would look is at the monitor's "switch-mode-power-supply!!! When Very Strange things start to occur with LCD back-lit monitors that's the FIRST place I would look for a problem.
12fixlouie

I have the same problem. Can't anyone help?

Here is a website that explains the big blue lock on the Dell LCD monitor and how to deal with it..a little too long to write so just sending you the website. If you have any questions let me know..
http://www.paulstravelpictures.com/Dell-LCD-Monitor-Flashing-Padlock-Icon/index.htm

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moniter will not turn off

hi,

It is possible that menu button on the monitor is stuck. I suggest to call your computer manufacturer where you purchased the monitor, check for the warranty and request for a replacement.

Keep me posted.

Thanks