Question about AOC LM729 17" LCD Monitor

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Black screen saying no signal

Turn monitor on and light is green. The screen is black and says no signal. light turns yellow.

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Turn off the computer and get a can of compressed air blow out all the dust and make sure everything is tight put back together and see iff it works. geek squad charges 99.99 to do this in store.

Posted on Jan 28, 2009

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Posted on Jan 02, 2017

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Turn monitor on and the light stays yellow will not turn green and screen stays black


When it lights up the yellow light instead of the green one, that means that the monitor is not getting a signal from the computer.
The things to try (from simplest to most complex) are:

  1. Make sure the computer is on and not in "sleep" mode -- press the "Caps Lock" key and see if it lights up the caps-lock light on the keyboard.
  2. Make sure the video cable is connected from the computer to the monitor (that the cable hasn't come loose on either end)
  3. If your monitor has multiple inputs, make sure it's set to the right (probably analog VGA or DVI) input
  4. If your computer has more than one video output (like a laptop with it's internal screen plus the external monitor) then make sure the external monitor is enabled
If none of those solve it, post a comment back here and we can dive in to the more complex tests

Sep 06, 2010 | Computers & Internet

1 Answer

Dell computer monitor wont come on when I turn


When you turn on most dell monitors they come on with a yellow light, then turn green when the monitor and video source synch. If your light is not turning from yellow to green, your monitor is either dead or not getting a signal from the video source it's plugged into. Verify in your BIOS settings that you have selected to output video through an installed card and not from the motherboard source. If the BIOS settings are correct, your monitor has died. If the light is turning green after you turn the computer on, press the menu button on the monitor and adjust the brightness/contrast until you have a picture. If you don't see anything when the menu button is pressed, then again your monitor is likely dead.

Jan 04, 2010 | Computers & Internet

1 Answer

Lg Flatron 17" monitor turns on you see the green light then


it's prb.. your video card not the moniter if a moniter goes from green to yellow " standby" it's prb the computer not the moniter

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Cpu no up, monitor shows


could be the whole pc is fried :(

Jul 10, 2009 | Computers & Internet

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Sharp light turns green thern turns yellow screen goes black


it is going into sleep mode, good luck with this.... i am currently asking how to get my hard drive to quite putting my monitor into sleep mode.

although it hasn't worked for me because my screen stays black, one of the options given to me is to try to start in safe mode and then adjust your settings to "never" on the energy/sleep/hibernate mode

some one else suggested that i remove and reseat the video card

hopefully one of those will work for you

Feb 14, 2009 | Sharp LL 172A-B 17" LCD Monitor

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i had the same problem now my monitor wont even turn on if i do that the power light just keeps blinking maybe its a sign of a dying monitor

Jan 16, 2009 | Sampo PD-70 15" Flat Panel LCD Monitor

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I found some solutions other posted that didn't come up the first time I looked. I did a reboot and I'm good to go!

Dec 07, 2008 | Acer Computers & Internet

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My monitor will not turn on


disconnect the monitor cable from your computer tower
if you get a 4 colored box which says power on self test. it means its not the monitor then you have to get the video card or the systemboard.

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