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Power up, three color box says no signal on the monitor.

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  • James Preston
    James Preston May 11, 2010

    Does the monitor work with another computer? Are you sure that you have the monitor plugged into the right port? Is the video integrated on the mother board? Or a separate card?

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  • 97 Answers

Your video card is bad

Posted on Jul 28, 2009

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1 Answer

My monitor keeps giving me a no signal message after i turn on my computer


  1. make sure that the video cable is properly connected between the monitor and computer
  2. change the video cable
  3. do a monitor selftest
  • turn off the monitor
  • disconnect it from the power outlet
  • disconnect it from the computer
  • turn on the monitor without the video cable
if you see the monitor information (a box with RGB white colors, the monitor is working)

  • problem might be the cable, video input port of the monitor or the video output port of the computer

Apr 10, 2010 | Acer AL1916W 19" LCD Monitor

1 Answer

Abrupt loss of signal to monitor.


May be your Video card. Try a different monitor to see if it is working. If not you may need a new video card.

Nov 15, 2009 | E-Machines eMachines Desktop PC

1 Answer

Why won't the HD channels come in on my lg flat screen monitor? We changed the cable box and everything. Any suggestions?


The first thing you need is the HD tuner. Since you stated that you changed the cable box I will assume that means it's HD ready.
So you have HD signal coming in to the cable box box by-way of a coaxial cable. Now you need to get that HD signal to the monitor. For this connection the standard coaxial cable normally used between the TV and cable box will not do the job. How many connection options you have depends entirely on the what is available on the monitor.
Normally there are three choices. Your monitor could have anyone of these, a combination of them or none if it's not HD ready.
They are Component cable, HDMI and DVI.
Component is a combination of three RCA type (red, blue, and green), connectors. Simply connect the "Component Out" from the cable box to the "Component In" on the monitor.
HDMI cable looks similar to a computer monitor cable but bigger. Same goes for this one. Connect the "HDMI Out" from the cable box to the "HDMI In" on the monitor.
An indirect connection can also be made if your monitor has a "DVI In" jack by using a cable that will allow you to come from the "Out" connection of either the HDMI or Component on the cable box to the "DVI In" on the monitor.
If you are unclear about anything or you have any other questions please just ask and I'll try and help out.

Oct 02, 2009 | LG Computers & Internet

1 Answer

Kds model 780 monitor no signal, power button does not work


My monitor does the same thing at times and sometimes shows "No Signal" and at other times the screen will maintain the images but the backgound color switches to mustard yellow. In each of these cases I have been able to solve the problem by unplugging the power cord from the electical outlet for about three seconds and plugging it back in. I have a KDS model 780 LCD.
GOOD LUCK

Dec 15, 2008 | KDS Radius RAD-5 15 in. Flat Panel LCD...

1 Answer

My monitor displays yellowish color instead of original color


yes please take the power on self test means disconnect signal cable and monitor will give
display without cpu if display appears then monitor ok fault is in cpu if not then fault is in monitor move signal cable and look display changes or not if changes then cable faulty replace it

Nov 11, 2008 | SAMTRON 55V 15" CRT Monitor

1 Answer

Sony Screen Colors


it may not have problem of monitor first take the post (power on self test) to do so you have to disconnect 15 pin signal cable from cpu and power on it will give display without cpu the massage "no signal check signal cable" will appear then monitor is ok problem is in cpu. if no display come then problem in monitor

Oct 25, 2008 | Computers & Internet

1 Answer

Color problem


There are three Cathod Ray guns responsible for the millions of colors.All colors are produced by mixing the three basic colors namely Red Green and Blue (RGB) at suitable proportion. If any one of the three guns fail firing then we get improper colors. This can be rectified by
(1) hitting the monitor at the back by keeping it on a pillow the screen facing down - it will reolve the problem if the failure is due to the loosening of the Head due to repeated thermal expansion and contaction.
(2) check the signal cable for loose connection, twisting etc on both ends - at the back of the CPU and Monitor (it is fixed)
TRY YOUR LUCK

ProfSweetlin
danielswweetlin@gmail.com

Jul 15, 2008 | Samtron 76df 17" CRT Monitor

1 Answer

Problem with the monitor


Hi,

The three boxes represent the built-in diagnostics of the monitor. The letters G is green, B is blue and R is for red, the 3 color guns of the picture tube of your monitor. The words "Self Test" indicates that it is in diagnostic mode since it has powered up, it is also then expecting a video signal from a source to be coming in; the display "Check Your PC And Signal Cable" indicates that it is not receiving any video signal from the source which is your PC or more specifically the PC's video card; and the display "Monitor Working" indicates that the diagnostic has determined that nothing is wrong with itself and therefore it has got to be your PC that is in question. The intermittent appearance of the boxes is when the diagnostics restarts itself and eventually finds the same problem.

To determine if it is the PC or the monitor, use another PC (even a laptop with matching VGA output) and try it with your Compaq monitor, see it it will work or alternately, try a different monitor to connect to your PC. The outcome will determine which is at fault.

If you have determined/verified that it is indeed the PC, you should focus on the video/graphics card. In some PC models/versions, the graphics/video is built-in to the motherboard and you should check the memory since this is shared. The only way is to replace either.

Hope that this be of some help/idea. Pls post back how things worked out or should you need additional information.

Good luck and kind regards.

Dec 07, 2007 | Compaq FS7550 17" CRT Monitor

2 Answers

Monitor color has been changed to yellowish.


There are three Cathod Ray guns responsible for the millions of
colors.All colors are produced by mixing the three basic colors namely
Red Green and Blue (RGB) at suitable proportion. If any one of the
three guns fail firing then we get improper colors.
Try
(1) Simply tap on the monitor and see the result.(Keep the monitor on during this trial.)
(2) Disconnect the Monitor.and Slap it at the back by keeping it on a pillow with the screen facing down - it will resolve the problem if the failure is due to the loosening of the Head due to repeated thermal expansion and contraction.
(3) check the signal cable for loose connection, twisting etc on both ends - at the back of the CPU and Monitor (it is fixed) -
(4)tighten the screws at the backside of the CPU

Best of luck

ProfSweetlin

Sep 14, 2007 | Samtron 76df 17" CRT Monitor

1 Answer

Dell ultrasharp 15 inch flat panel lcd has no power and does not turn on at all


Disconnect the monitor from the computer, then turn it on. You should see three bands of color (red, green, and blue), which is the self-test feature of the monitor. If you can see all three colors, the monitor itself is probably OK, and it will mean that you need to check the connector on the monitor cable, the connector on the back of the videocard in the back of the computer, or reseat the videocard itself. One of the connectors could be damaged, or you could have a bent, broken, or missing pin within the connector. If a pin is bent and touching the shell of the connector, it can send the video signal to ground, making the monitor appear to be dead. BE VERY CAREFUL if you try to straighten the pin; they are fragile, and if you break the pin off completely, you will have even more problems to deal with... If one or two of the color bands are not visible, the LCD monitor is defective, and you'll have to decide whether it is cheaper to repair it, or simply to replace it... If you still can't locate the problem after checking the system as I've described, get another monitor to test the computer with. If the second monitor works properly, you most likely have a problem with the Dell LCD; if the problem still exists after switching monitors, then you most likely have a problem with the computer, and NOT with the Dell monitor...

Apr 01, 2007 | Dell UltraSharp 1704FPT 17" Flat Panel LCD...

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