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The following site has step by step instructions on steps you can try: http://www.ehow.com/how_5008634_fix-lockout-display-computer-monitor.html
I'll paste them below:
All computer monitors, whether they are LCD or CRT style, have a built-in feature called the on screen display (OSD) lock out that prevents users from viewing any images on the monitor. If your computer screen has accidentally been set to the OSD lock out setting, there are several different ways you can remove the lock out, depending on the make and model of your particular computer monitor. 1 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. 2 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. 3 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. 4 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 of settings. 5 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.
Email Dell tech. support with your issue.
But first try removing the power cord and press and hold the power button on the front face of the unit for 30 seconds..
Remove the battery on the remote and press any key on the remote for a few seconds.
Replace the batterys on the remote and power cord on the Monitor.
Try to power up the unit and see if that works.
The Monitor/TV have a CMOS battery which retains all your setup information. By removing the power and holding the power button, you may be able to clear the memory and reset the unit.
Hi!! I have a Westinghouse L1916HW 19" DVI LCD 2ms Widescreen Monitor and it turns itself off . Sometimes it works without problem for long time or just for 15 mins, and after turn on it several times the problem disappears. Now,when it is working without the problem, sometimes the volume menu appear on the screen without touch the monitor and if you try to close it, appear again.. I am using it with Windows 7. I need help. Now, I have a router wireless close to it, Can it affect the monitor?
you did not given details of model, company complet discreption of problem ok no problem you press the four keys on the monitor for five seconds simultaneusly or till it will show the massage "keys unlocked" then release
The key lock is a function that can only be reset with a remote. Go to www.zenith.com and under "support" you'll find product manuals. You can enter your model number and get the manual, but once "key lock" is on, you'll need a remote to change it.
Do you use the remote control or buttons on the tv itself? Many TVs have a child lock feature that will prevent operating the TV without the remote control.
If you use the remote control you should be able to change chanels, and to disable the child lock from the menu.