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Monitor light blinks

I have not checked the voltage and not sure how but I have tried 4 power supplies 3 motherboards at least 5 video cards. when i plug my monitor in to the power and turn it on you see where it is searching for conection. then you hook up a video card not hooked up to the motherboard and turn on the monitor you see the green light then you hear a click the green light starts to flash and nothing on the screen not even the searching logo. i've tried 4 monitors with the same results.

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Have you tried hooking the monitor up to a known working motherboard video or video card in a motherboard? it sounds like you may not have the settings in the motherboard correct jump the cmos clear to reset the motherboard connect everything then turn on your monitor then turn on the computer and get back to me in this thread.

Posted on May 08, 2008

  • Scott Hill
    Scott Hill May 27, 2008

    ok hope the answer helped

  • Scott Hill
    Scott Hill May 27, 2008

    one more option get a powerful power supply the video on most new motherboards for video output need 400 or 450 watts so try a bigger one that may do the trick you can have a tech see if it will fire on a shop power supply and get video out on your video card.



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Lx6200-01 has a blinking blue light on power up and monitors are displaying "no signal"

We will assume the monitor you are using is ok. Check these items (in no particular order):
1. Bad RAM - remove and re-seat each module (you can take each one out and try to re-boot to see if it makes any difference)
2. Short circuit, usually between motherboard and case
3. Bad monitor cable (make sure it's not loose at either end)
4. Incorrect overclock setting
5. Bad display adapter (unless you added one, I believe this mother board has integrated video) - you can try adding an external video card if you have an open slot and and the PSU can take it.
6. Bad motherboard
7. CMOS battery - try replacing it, especially if it is over 6 years old
8. Overheating due to dirt collection inside - blow it out with canned air including the power supply unit (PSU)
9. Virus - not too likely

Mar 03, 2015 | Gateway LX6200-01 PC Desktop

1 Answer

After boting monitior is getting shut down

When the monitor shuts down, is the activity light on the monitor blinking yellow? or staying yellow constant? Have you tested another monitor? When does the monitor shutdown exactly what is the computer doing at the time the monitor shuts down?

1. Blinking yellow means failing monitor. Not all monitors will exhibit this behavior. For example my Acer Monitor blinks with a blue light when no video input is detected. It doesn't always mean the monitor is bad, but may indicate the video card is failing. Also check and/or replace the video cables

2. Solid yellow means no video input detected Not all monitors will exhibit this behavior. For example my Acer Monitor blinks with a blue light when no video input is detected. It doesn't always mean the monitor is bad, but may indicate the video card is failing. Also check and/or replace the video cables

3. Testing another monitor tells you if the video card is failing. If another monitor works, the problem is your old monitor failing, if a new monitor doesn't work, then the problem is more than likely a failing video card.

4. It is rare but sometimes the Video PCI slots can go bad, while another may work on the same motherboard. This further indicates if it's a motherboard issue, and not the monitor or the video card. Just change the PCI slots the video card is plugged in to and see if it works.

5. Power issues can cause this video issue as well; For example if your PSU is not strong enough to support your video card, it may exhibit no input detected issues past a certain point in the boot process. This is due to lack of power being supplied to the video card. MOST video cards have a warning of sorts if this is a case, but some do not. This issue is more common with higher end gaming video cards and/or lower end power supplies.

The best way to test this is to disconnect ALL devices from the motherboard that require power; For example; CD drives, Hard drives, USB devices that may be plugged in other than keyboards/mice. Only boot the PC with the video card, RAM, and CPU installed. If you get video start attaching 1 device at a time and doing a fresh boot with each device connected. So if the PC boots fine with video on the monitor when the CD Drive is plugged in... it's not the CD Drive causing it. Then hook up the hard drive WITH the CD drive, and see if the PC boots with video then... If it does not, you can infer a power issue might be causing the problem.

Another issue that may effect the video card directly pertaining to power issues are; Try swapping the power cables to the video card with a different power cable. That is to say a power cable coming from the Power Supply that isn't connected to anything or in use by anything else. It is possible a power cable line is bad and/or not working in which case it's a Power Supply issue.

In some cases; This test will be negative on all accounts; At this point, It may be your RAM/CPU causing the issue; Try reseating the ram, that is to say uninstall the ram physically, use a cloth to clean the gold prongs on the ram sticks, and place the ram sticks back into the motherboard; See if it boots up with video then. If it does not; Try removing ram sticks 1 or 2 at a time as required and checking again. This helps determine if it's a specific ram stick causing the problem.

6. If the video STILL is not showing up you will want to check the following.

Check the motherboard for blown capacitors; They will appear in the following forms; Clearly bubbled tops on the capacitors; Exploded tops or yellow crystalized liquid leaking from one or more of the capacitors (like battery acid). This causes a HUGE list of random issues that are symptomatic of power issues. In this case a (Failing Motherboard) Most common on intel and dell motherboards especially on older hardware/PC's.

The CPU is the hardest thing to detect if it's failing, and is rarely the cause, if common sense and care are taken when handling a CPU.

At this point if you still can't figure out what's causing the problem; Replacing the motherboard or monitor is recommended. Monitor if you do not have another monitor to test. Or motherboard if you've exhausted all other troubleshooting steps.

I realize it's a lengthy description, but your description of the problem wasn't exactly specific so I wanted to be thorough and cover all the basis that could cause this problem.

Hope this helps.

Dec 09, 2013 | Intel D845GVSR Motherboard

1 Answer

On board video card is not working on A7V8X-LA motherboard

No Signal means no video signal from the computer.

Means the computer isn't sending a video signal to the monitor.

Logic would dictate that the problem is the graphics chipset.
Whether it be Integrated Graphics (OnBoard) of the motherboard, or a separate graphics card.

However there is a different culprit, and one that is often overlooked,

Power Supply

A Power Supply with a weak voltage power rail, will not have enough power to turn the Processor (CPU) on.

1) If ALL of the LED lights were on at once, they would use less than 1 Watt of power.

2) EACH fan uses 2 to 3 Watts of power

3) A typical Processor can use 51 to 125 Watts of power,
Just depends on what Processor it is.

This is why one may see LED's light, and possibly fans spin, but No Signal.
Not enough power to turn the Processor on.

Computer dirty inside? That just 'kills' a Power Supply.

The cooling components for a Power Supply, is the Heatsinks used inside, and a small internal fan,

Click on the photo of the exposed Power Supply, to enlarge.

Looking in-between the letters B and C, plus C and D, you see Heatsinks.

Fins arranged in block shapes, and attached to a single piece of long metal.
The Heatsinks absorb heat from whatever object they are placed against.

The thin fins of the Heatsink then radiate the heat away.
Air flow from the small internal fan, helps carry heat away from the fins of the Heatsink's.

When dirt, dust, hair, carpet deodorizer, lint, name it; coats the fins of the Heatsinks, and the blades of the fan, the Power Supply overheats.

Heat = Wasted Energy

The Power Supply tries to keep up with the call for power, but eventually components inside fail, (Go bad), and the Power Supply fails.

Number one thing when diagnosing a desktop computer, is to make sure the Power Supply is good. Make sure it is putting out the correct voltages.

Power Supply is deemed to be good, THEN go on.

Next thing in the list for desktop computer failure, is the computer is dirty inside.

The Power Supply in your personal computer (PC), is an Converter.
It converts the high AC electricity from your home, or business;
(120 to 240 Volts AC, depending on country), into 3 low DC Voltages,

A) 3.3 Volts
B) 5 Volts
C) 12 Volts (ALL are DC Voltage)

In comparison two D cell flashlight batteries produce 3 Volts DC.

ALL Orange wires are 3.3 Volts
ALL Red wires are 5 Volts
ALL Yellow wires are 12 Volts

ALL Black wires are Ground wires.

A multimeter set to DC Voltage, is used to check those power rails.

Use a KNOWN to be good, Compatible power supply, for a temporary test unit.

Power is known to be good now?
Then I concur the Integrated Graphics on the motherboard may be bad.

Use a graphics card.
Using a graphics card bypasses the motherboard Integrated Graphics. Attach the monitor to the graphics card.

FOLLOW Anti-Static Procedures.

Graphics card is installed. Monitor hooked up to it. Turn the computer on.
You should get a display, albeit it is going to be a 'Fred Flintstones' looking screen.

Screen resolution won't be correct, and Color quality will probably be 8-bit.

Looks worse than a computer using Windows 95.

That's OK. You can now install the Drivers for the graphics card, because you can now at least SEE the screen.

Post back in a Comment.
Want to know about Power Supply first.


Mar 15, 2013 | HP Pavilion Computers & Internet

1 Answer

The power light on my PC monitor keeps blinking and the monitor wont come on

There are a number of reasons why this is happening, but one thing for sure is that your data are safe.1. Try to check your PC monitor. Check the power supply and try to connect it to another PC if it turns on. 2. PC could be under sleep mode. Try tapping the keyboard (Enter, Space Bar), move the mouse to return it to normal operational state.
3. If your PC came with another video card, try connecting the PC monitor to the on-board video card connection.4. Check your PC if the fans are running, if its not, it could mean that the power supply is busted.

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I have a an35n ultra v1.1 motherboard I power on my tower,it does power on but it wont post I dont see anything wrong with cap's cpu was tested and checks out Power supply is good Tryed a new video card...

Hello Phenom, Hi.... to properly run/test a motherboard, you need to make sure this parts are good with no doubt functioning. 1. the power supply, 2. Memory, 3. keyboard, 4. Processor with FAN 5. PC speaker(built on-board or the thumb speaker) and 6. monitor How to test. First remove all motherboard connections. Now reconnect the following. 1. make sure that the power supply 20/24 pin is connected properly to the motherboard (and please test this power supply before making connections. To test independently short green wire to ground and plug the unit. you should see the fan spin) 2. make sure that the 4 pin 12volt power connector is also plug in nice and tight. 3. clean the memory slot using a clean paint brush and the module (DDR/2) terminals (the contacts) using an eraser, 4. connect the keyboard, 5. make sure there is a PC speaker connected. 6. connect the power switch of the front panel, 7. Connect a monitor on the VGA port 8. Power on the PC. 8. Look at the keyboard lights 3 LED momentarily. num lock + caps lock + scroll lock and after several seconds 1 LED light, num lock only. If you reach this part you should also hear a beep. then the POST will appear. If you don't reach this part, start again from the top. do this several times. Still no response? you motherboard is bad.

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I have a dell optiplex sx280 computer and monitor that has lapsed into ''power save mode'' and I have been unable to ''awaken'' it (I'm not sure which is ''asleep'': the monitor or computer!) from sleep. I...

How's the status light of your computer monitor? is it blinking amber? and the status light of your computer tower's power button? blinking amber as well or solid green or no light at all?

1. Disconnect all the connection at the back of your computer tower
2. Press the power button of the computer tower for 15 seconds
3. Reconnect the power button and the monitor cable at the back of your computer tower and turn on the computer (if it turned on that means that one of the device plugged at the back of your computer tower is faulty)
4. If still the same problem, open up your computer tower.
5. Reseat the video card, Reseat Hard drive, Reseat Memory, Reseat CPU, Reseat power cord coming from the CPU to your computer (doing all things one-by-one to pin-point the root cause of the issue)

If none of the troubleshooting steps fixed the problem, possible that the power supply is faulty and if the power supply is faulty sometimes it goes with the motherboard.

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2 Answers

When powering on get no input to monitor board nu a7n8x-e

Make sure you have connected into the correct video port. DVI should be used for LCD monitors and VGA should be used for CRT monitors. Since both ports look the same people often get confused. Try it and let me know.


Jan 02, 2010 | ASUS A7N8X-E Deluxe NForce 2 Ultra 400...

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Monitor comes on but wont show picture

You should make sure the cable is plugged into the video port on the back of the tower. Also, if you have more than one video card, ie an "onboard card" and another card that was added later, try alternating one to the other and see if the other one works. You can identify video ports by finding the blue pentagonal plug. It also will be the only plug that your monitor cable fits into (that is describing a VGA cable, a white cable is a DVI cable and is even easier to identify.) You might also want to make sure the video card wasnt jostled out of place. The final solution could be you have developed some bad memory modules, or the memory was jostled out of its slot during the move.

Jan 03, 2009 | Dell Computers & Internet

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Blinking green light on the back of hp pavilion

1. Your smps is OK for power supply
2. check the beep sound for RAM and Video card (If it is long beep the RAM is having and short and frequent the Video card) o

3. Remove RAM then start ssytem see the response shoutdown, clean the RAM place it back start the ssytem
4. Remove the CMOS battery or short the jumber for any setting in BIOS start the ssytem
5. Disconnect all the cables connecting motherboard including Hard disk except SMPS power supply to Mother board

Jun 22, 2008 | Computers & Internet

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Monitor light blinks

have you tested the power supply connection feeds? test each connector I think you will find your power supply has failed on either the 5 volt or the 12 volt side more than likely 5 volts are down' the agp adapter needs 5 volts to run. since you have changed out every thing else I would replace that or test your dads power supply in your computer, that should do the trick

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