Philips screen is showing - monitor controls locked

Conrad, your manual should tell how to unlock.
If you have no manual google search for one.
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you have to carefully force open the clipped back case of the monitor and disconnect completely the cable to the front control buttons, then the monitor works fine though no adjustments can be made

Dont Buy Philips monitor. I have 20 pcs monitor and after one year half of them had malfunction. smartimage with vertical lines back and forth and that all controls are locked that cant be unlock by holding any button. Some had white screen when Resolution exceed 1024X768 (when 1280X768) after a year.

Maybe they program it to malfunction after a year. My CDR king and AOC monitor had no problem 2yrs to present date.
Philips monitor are garbage
Sorry for bad english.

The lock/unlock function is for locking out the control buttons on the monitor.
http://www.fixya.com/support/r4646147-philips_lcd_monitor_loc_unlock

23 Oct 2008 ... There are a few things you can do to solve the problem, ... The menu should be reset and the flashing OSD control message should disappear. ... controls locked, then it comes up again saying OSD main controls unlocked. ... I have a Philips 190S monitor. I do have a button to enter the onscreen menu. ...
filetonic.com/blog/2008/10/23/osd-main-controls-blocked/

Is there button of keyboard, mouse not probably work,if it was ,that is the problem of mouse or keyboard or CPU ,If it not you want to try by going into control panel and will found that some your file is missing,then try to install.

I am not able to find the solution but I have got the very same problem with my HCL LCD monitor.

Estava também com o mesmo problema de voces, já estava irritado, então abri o monitor e desconectei a ligação com a placa de controle dos comandos dos botoes do menu. é fácil fazer. Só que não vai funcionar mais os botoes. pelo menos essas mesagens não vão mais incomodar.

Philips say "To unlock the OSD Controls press the “MENU(OK)” button for more than 10 seconds while there is video input from PC."