Question about NEC MultiSync LCD1830 18.1" LCD Monitor

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Monitor not working

When computer is powered on the monitor keeps showing the red blue and green box saying self test and just keeps popping up on the screen and monitor will not come on.

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These messages appear during if the video cable becomes disconnected or
damaged.(most likely you will need to replace it)
Turn off your monitor and reconnect the video cable; then turn on both your computer and the
If your monitor screen remains blank after using the previous procedure, check your video
controller and computer system; your monitor is functioning properly

Posted on Nov 14, 2007


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Posted on Jan 02, 2017


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1 Answer

Screen won't turn on

You can try to do the monitor self test.
Monitor Self Test:
1. Physically test the monitor autonomously from the computer.2. Switch both the monitor and the computer off, and then disconnect the VGA cable le from the computer.3. Turn the monitor on, pressing the power button for about three seconds. The self-test screen will come up .4. If the image is clear, bright, and shows red, green, and blue, the monitor is working properly. Video issues may be due to the video resolution in the computer, and not the monitor.5. If the image is not apparent and intense or the colors are not accurate, then the trouble is with the monitor or some of the (OSD) settings. In this case, test your particular monitor's information for OSD.
It is always important to check the color of your power light for so you can distinguish if the monitor is defective. Getting red lights on the the power panel states that the power section of the monitor is faulty.

Dec 03, 2011 | Emerson Televison & Video

1 Answer

The monitor will not show a picture the led is flashing green

* If the issue is visible in the monitor STFC (Self-Test Feature Check), the monitor is defective. * If not, the issue is with either the video card driver or the video card.
* Turn off both your PC and monitor * Disconnect the monitor from the PC (either the white DVI or the blue VGA. They should never be connected at the same time to one PC) * Turn the monitor on * The floating Dell red/green/blue/white dialog box should appear on a black background * Check for the issue

Mar 02, 2011 | Dell E173FP 17" LCD Monitor

1 Answer

The screen has a box that says : 1:Analog input Self Test Feature Check Red (line across) Green (line across) Blue (line across) White (line across) if you push the menu botton you get a other screen...

The issue is that the monitor in not getting the signal. This tells me that the video adapter ( or on board video) has went bad. Try another video card if all your doing is social media and surfing you can pick one up for around 20.00

Oct 27, 2017 | Dell Computers & Internet

1 Answer

My computer is showing a floting box which say self test feature check, wit red,green blue and white box.What do this mean

its showing u monitor self test feature screen issue either with the monitor cable or monitor or the graphic card

Nov 19, 2009 | Dell Dimension 2400 PC Desktop

2 Answers

Computer powers up, but monitor shows a self test

Your video output is bad. Either the video card, or the onboard video built into the computer. You need to swap out the card or add a card to bypass the built in video port on your computer.

Thanks and please take a moment to rate as fixya.

Feb 11, 2009 | Gateway 550GR PC Desktop

1 Answer

Dell172fpb 17" monitor

Self-Test Feature Check (STFC) Your monitor provides a self-test feature that allows you to check whether your monitor is functioning properly. If your monitor and computer are properly connected but the monitor screen remains dark, run the monitor self-test by performing the following steps:
  1. Turn off both your computer and the monitor.
  2. Unplug the video cable from the back of the computer. To ensure proper Self-Test operation, remove Analog (blue connector) cables from the back of computer.
  3. Turn on the monitor. The floating 'Dell - self-test Feature Check' dialog box should appear on-screen (against a black background) if the monitor cannot sense a video signal and is working correctly. While in self-test mode, the power LED remains green and the self-test pattern will scroll through the screen continually.
  4. Turn off your monitor and reconnect the video cable; then turn on both your computer and the monitor.
If your monitor screen remains blank after you use the previous procedure, check your video controller and computer system; your monitor is functioning properly.


Oct 26, 2008 | Dell E171FPb 17" Flat Panel LCD Monitor

2 Answers

Monitor trouble shooting

what would i do for my monitor that went blank

Apr 07, 2008 | Dell E173FPb 17" TFT LCD Monitor

2 Answers

Green box keeps popping up in upper right corner

You should be watching your dvd's on an input and not on tv analog 3. Every time the tv "senses" a signal change in the audio that screen will pop up. Connect the DVD player to the tv by using either the red, white and yellow (composite) connections or using the green, blue, red, white and red (component). Once you are on an actual input that box will stop popping up.

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