http://www.thefakegeek.com/2009/04/how-to-unlock-an-osd-lockout-problem/
How to Unlock an “OSD Lockout” Problem
This has most likely annoyed many of you at some point. You turn on your monitor one day and see a jeering message telling you something about an “OSD Lockout”. It doesn’t allow you to change any of your monitors settings, including the setting intended to turn off this message. While I’ve only seen this error on HP monitors I know that others have encountered it on other brands as well. The fixes I provide should work on those monitors too. (Note: OSD stands for On Screen Display.)
Fix One:
Plug in the monitor and power it up. Hold down the Power button until you get a message saying “OSD Unlocked”. If the problem...