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Power your computer
completely off and then remove the monitor cable from the port on the
back side of the computer case. Reattach the cable and make sure the
pins are correctly screwed in all of the way. Power the computer back on
and check to see if the OSD lock out message is still being displayed.
Check the manual that came with your computer or monitor and
locate the troubleshooting section if you are still receiving the OSD
lock out message. Find the OSD lock out heading and read the method that
your particular model of monitor uses to remove the lock out. Follow
the instructions to remove the lock out.
Attempt generic lock out removal procedures if you no longer
have the manual that came with your monitor. Press and hold the "Menu"
button located at the bottom end of your monitor for 15 seconds and wait
to see if the OSD lock out message disappears.
Press the "Menu" button again if the lock out message remains
on the screen. Use the arrow buttons to navigate through the main menu
options. Highlight the "Settings" or "OSD Menu" option and then hit the
Menu key again to access the new list
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The OSD Settings
Scroll down to the "OSD Lock" heading. Use the arrow keys to
change the setting to "No." Hit the Menu key again to return to the main
menu. Scroll over to the "Exit" setting and then hit the Menu key a
final time to exit the menu setting and remove the OSD lock out.
try disconnecting your network cable and adjust the settings again, if you cant, enter safe mode by pressing f8 in the startup and select safemode then adjust the contrast there.
Or is this in the CRT monitor? inside the monitor? there are no viruses ever made for monitors. So its most likely a hardware fault in the crt. Maybe its time to buy a new one. LCD preferably easyer on your eyes.