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Monitor not working, but showing power on when not connected to pc

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Your video card has a problem if you are using an after maket video card (if you got an upgrade) try unpluging it and connecting your monitor to your mainboard video card (vga slot) its the medium size blue port

Posted on Sep 08, 2008

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Posted on Jan 02, 2017

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My new moniter of aoc is not working and showing message that No Signal i cheacked power cod and cheacked other power cods but still showing same mssage


Hi,
Usaully when monitors show message that means the monitor is working fine what you have to check if the cable going to the computer is good and connected properly and if so you have to troubleshoot your pc.
Regards

Mar 07, 2015 | AOC Computers & Internet

1 Answer

Hp G56-129wm won't boot. Powers up but doesn't show any screens, and then dies!


2 Suggestions:-
1) Did you tried to connect External Monitor? Tell me the status
2) Remove all Power Adapters and battery. Push the Power Button for 15seconds. Again Connected the battery and Power Adapter. Check if its working or not. If not then Must be Motherboard Problem.

Jul 24, 2012 | HEWLETT-PACKARD G56-129WM Laptop PC

1 Answer

PC SWITCHS ON BUT NO PICTURE


1. Check to make sure your monitor is on! Some monitors have more than one power button or switch - check to make sure they're all switched on.Check for disconnected monitor power cable connections. Your monitor might be working fine and your only problem may be a loose or unplugged monitor power cable.Note: A disconnected monitor power cable could be the cause of your problem if your monitor's power light is completely off.Check for disconnected monitor data cable connections. Again, your monitor might be turning on without a problem but no information can get to it because the cable that connects your monitor to your computer is disconnected or loose.Note: A disconnected monitor data cable could be the cause of your problem if your monitor's power light is on but is amber or yellow instead of green.Turn the monitor's brightness and contrast settings completely up. Your monitor might be showing information but you just can't see it because these display settings are too dark.Note: Most monitors today have a single onscreen interface for all settings, including brightness and contrast. If it turns out that your monitor isn't working at all then you'll likely not have access to this interface. An older monitor might have manual knobs for adjusting these settings.Test that your computer is working correctly by connecting a different monitor that you are certain is working properly to your PC. Your monitor may be working fine but your computer might not be sending information to it.If the new monitor you connected does not show anything either, proceed to Step 6.If the new monitor you connected does show information from your computer, proceed to Step 7.Important: When testing with the new monitor, make sure you use the data cable that came with it and not the one from your original monitor.Determine why your computer isn't sending information to your monitor. Since neither monitor works, you now know that the computer is not sending information to the monitor. In other words, you've proven that your computer is the reason that nothing shows up on your monitor.Chances are your original monitor is working fine.Test your original monitor with a monitor data cable that you know is working. It's possible that the monitor itself is working properly but it can't receive information from the computer because the cable that connects the monitor to the PC is no longer working.Note: If possible, test using the data cable from the monitor that you successfully tested with in Step 5. If not, purchase a replacement monitor data cable to test with.Note: The data cable on some older monitors are permanently connected to the monitor and are not replaceable. In these cases, you'll have to skip this step and proceed to Step 8 Replace the monitor.

Sep 27, 2011 | Mesh Matrix 6000+ DX PC Desktop

1 Answer

My pc does not give display ? Why


Time Required: Testing a monitor could take from a few minutes to much longer depending on the cause of the problem Here's How:
  1. Check to make sure your monitor is on! Some monitors have more than one power button or switch - check to make sure they're all switched on.
  2. Check for disconnected monitor power cable connections. Your monitor might be working fine and your only problem may be a loose or unplugged monitor power cable. Note: A disconnected monitor power cable could be the cause of your problem if your monitor's power light is completely off.
  3. Check for disconnected monitor data cable connections. Again, your monitor might be turning on without a problem but no information can get to it because the cable that connects your monitor to your computer is disconnected or loose.
    Note: A disconnected monitor data cable could be the cause of your problem if your monitor's power light is on but is amber or yellow instead of green.
  4. Turn the monitor's brightness and contrast settings completely up. Your monitor might be showing information but you just can't see it because these display settings are too dark.
    Note: Most monitors today have a single onscreen interface for all settings, including brightness and contrast. If it turns out that your monitor isn't working at all then you'll likely not have access to this interface. An older monitor might have manual knobs for adjusting these settings.
  5. Test that your computer is working correctly by connecting a different monitor that you are certain is working properly to your PC. Your monitor may be working fine but your computer might not be sending information to it.
    • If the new monitor you connected does not show anything either, proceed to Step 6.
    • If the new monitor you connected does show information from your computer, proceed to Step 7.
    Important: When testing with the new monitor, make sure you use the data cable that came with it and not the one from your original monitor.
  6. Determine why your computer isn't sending information to your monitor. Since neither monitor works, you now know that the computer is not sending information to the monitor. In other words, you've proven that your computer is the reason that nothing shows up on your monitor.
    Chances are your original monitor is working fine.
  7. Test your original monitor with a monitor data cable that you know is working. It's possible that the monitor itself is working properly but it can't receive information from the computer because the cable that connects the monitor to the PC is no longer working.
    Note: If possible, test using the data cable from the monitor that you successfully tested with in Step 5. If not, purchase a replacement monitor data cable to test with.
    Note: The data cable on some older monitors are permanently connected to the monitor and are not replaceable. In these cases, you'll have to skip this step and proceed to Step 8.
  8. Replace the monitor.
    WARNING: A computer monitor is not a user serviceable device. In other words - do not open the monitor and attempt to repair it yourself. If you would rather have your dead monitor serviced instead of replaced then please let a professional do it.

Aug 02, 2010 | Dell Dimension 2400 PC Desktop

1 Answer

My pc lights and fans work, but the screen shows nothing.


Check everything you need to check.

Follow the following tips and guides.

  1. Check if your computer monitor is tightly connected or rather properly connected to the CPU.
  2. If it is connected properly but still doesn't functions, try plugging another monitor and see if it lights and works.
  3. If the other Monitor runs then the old monitor is your problem. (maybe the problem is the cables or the tube itself.
  4. As for me, i advice you to use a monitor which gets its power from the CPU. (the power cord of your Monitor is not a plug but rather a connection from Monitor to CPU.)
If you have other questions and concerns regarding your problem and the guide shown above, feel free to update this post.

If you also need some drivers, kindly update me.

Apr 02, 2010 | E-Machines T3958 (827103050974) PC Desktop

2 Answers

Our computer screen will stay on for one second and then go black. Green button to signify it's on, is still showing, it simply goes black. What is happening and how can I fix it?


sir if u really love your computer, then take it to the nearest dealer. The problem is might be with the capacitors.

But my suggestion hence, is to isolate the power board (the one that has the socket for the power input), check if any of the capacitors (the tall cylindrical structures) have bulging tops, if they do, try to replace them (Novices please bear the polarity in mind when you play with capacitors) with ones with higher rated ones (especially the voltage rating, normally these would be rated for 25 volts, so try getting one that is one step higher.

Feb 27, 2010 | BenQ FP71G 17" LCD Monitor

3 Answers

What does the red light mean next to the power button?


The red light next to the power button is usuall the hard drive led which should blink every time the hard drive is in use, there is normally a green or yellow light for the power that shoukld stay on constant when the computer is on.

Feb 09, 2010 | Intel Compaq EVO D500 (RBMDTCPQP42400) PC...

2 Answers

LG LCD Monitor L1530S problems


Most screens will show nothing or go to power saving mode until the PC is turned on. The monitors need a signal in order to be 'active'.
From your description it could just as well be a problem with the PC rather than the monitor. The easiest way to find out is to connect another PC or laptop to the screen or connect another monitor to the PC unit.

Did you try pressing the Del key or F2 key when you turn on the unit to get into the Bios?

Jules

Jul 16, 2009 | LG L1530S 15" LCD Monitor

1 Answer

Monitor Not Showing A Picture. Light flashes Yellow and Green.


use the onboard graphics instead of a seperate graphics card (if installed) to test the screen.if it still doesn't work then unplug your monitor from the mains supply and plug in again to reset it. i doubt it's your monitor that is the problem though. but look on the back of your pc for another connection for your screen. the onboard graphics connection is normally vertical near your ethernet port and mouse and keyboard inputs.

please rate me and give me a fixya! if it helped.

Apr 05, 2009 | Acer AL1713M 17" LCD Monitor

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