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Monitor says no signal

When I boot up my computer the Monitor says no signal, The computer lights are on.I turn the power strip off.The computer and Monitor turn off and then I turn the power strip back on and the Monitor and Computer turn on with out a problem.Sometimes I have to do the above 2 or 3 times.This only happens in the morning when I boot up my system.I think its a Computer problem and not a Monitor problem, The same thing happens when I had my old CRT Monitor hooked up.Can you please tell me what the problem is?Thank You

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  • RBlank111 Dec 30, 2008

    No the computer does not beep at all.I bought the system in January 2008 and this has happened sense March or April. I hope this helps.Thanks knotbeerdan

  • Dan rogers
    Dan rogers May 11, 2010

    does the computer beep several if at all when this happens?

    How long has this been happening

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Is this a brand new system? What is the make/model?

This is a peculiar problem, as the computer was working fine for several months after you purchased the computer, then suddenly started this behavior. The fact that you do establish normal operation after the restart eliminates a few culprits. Your monitor is perfectly fine, as you eliminated that by trying another (same problem). I doubt the problem is your BIOS, as the OEM BIOS is usually a very solid part of the system. Unless you updated it in March/April?

The hardware should be fine--if there's a hardware problem, usually it works or doesn't work, or will work intermittently in an unpredictable manner (meaning, you'd start up and everything would be fine, but later on the video would cut out).

Also, try this experiment: When you start up the computer and you get the "no signal" indicator on the monitor, shut down the computer and leave it off for about 5 minutes. Start it again. If the problem repeats, it could be that there's some kind of software conflict between the operating system and BIOS, but a warm restart bypasses this.

It is possible that a Windows update that occurred around March/April may be conflicting with a driver or the BIOS. There are a couple of things you can try... In the "Accessories > System Tools" there is a System Restore utility. If you haven't made many changes to your system since March/April (e.g. installed a lot of device drivers, components, software), you could try restoring to a point where you are certain the problem wasn't occuring. If that works, you know that a software update is the culprit. If it doesn't, don't worry--you can "undo" the restore and go back to where you were so you don't lose other things you've installed (your registry gets updated frequently over time and you don't want to lose that).

There may be an updated BIOS for your computer as well. If you bought it new, it doesn't guarantee they had the latest installed when you got it.

Good luck!

Posted on Dec 30, 2008

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You should try resetting the BIOS (either by changing the right jumper, or by pulling out the CMOS battery, or whatever religious ritual your brand of motherboard requires, such as sacrificing a chicken on the keyboard), because it sounds like you've got a problem with one of the busses (e.g. the PCI bus, the AGP bus, the Chicago-bound Bus, or whatever). It may only be a software problem, which you might be able to get rid of by resetting the BIOS; but if your computer still displays the same vital signs as an ashtray, then you've got a more serious problem on your hands. Post back here and we'll see then.

Posted on Dec 30, 2008

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Dell inspiron 530 desktop won't boot, fan is running, no signal on monitor


It sounds like either your monitor or video card inside the computer is bad.

If the monitor is showing the "No Input Signal" message then the video card inside the computer is bad. The monitor is ok otherwise it would not be able to display the No Input Signal message.

When you plug in the power cord is there any lights whatsoever on the laptop, where the plug goes in or on the AC Adapter of the power cord?

When you press the power button do you hear fans running, hard drive spinning, lights on the computer, hear any beeps or lights constantly blinking, hear the DvD/CD drive click and the light on the drawer of the DvD/CD turn on for a second or two? If so the computer is trying to boot or may have booted, but the screen is not showing for some reason.

Beep tones and blinking lights tells the technicians what is going on with the laptop and why it is not booting. Most times it's a motherboard issue when you hear beeps or blinking lights continuous. Most times the problem is with the memory or Video Card. Count the Blinking Lights or Beeps and take note of their pattern (1 Long or 1 Long followed by 2 Short).

Maybe you have a Static Charge Buildup. Remove the Power Cord, then Press and Hold the power button for 30 seconds. After 30 seconds plug the power cord back in and hit the power button to see if it boots.



Maybe your memory is bad or the memory slot is bad.

Remove the Power Cord, Open the Case and remove one of the memory chips. Set the chip aside then try rebooting the computer. If it boots, then you know the memory chip you set aside is bad so mark an x on it with an ink pen. If it fails to boot then move the chip to the next memory slot and try rebooting. If it fails take the chip out and set it aside, then put the other chip in and try booting it in both slots. If it boots, just to verify that the chip set aside is bad, mark an x on it and put it into the open memory chip slot and try booting.

Jun 06, 2012 | Dell Inspiron 530 Desktop Computer

1 Answer

Monitor was in safe mode turned computor off and removed and replace ram. Monitor now flashing RV370 P N 113 A62801 106 BIOS not sure what to do now. to get computor booted back up


Hi...sounds like your video card has died on you. Do you have another video card lying around to swap out with the old and try?

When the video card is sending power to the monitor, the light will be green - if the light never turns from amber to green when the computer is booting, this means that the video card is not sending a signal to the monitor, probably because its toast.

May 01, 2011 | PC Desktops

1 Answer

When i turn on my computer the screen stays black as if it's off however, the computer is working fine. Sometime it flashes on but the goes back to black.


I suggest that your computer isn't working fine, it just appears to be.

But to know for certain you need to first diagnose whether the problem is the computer, or the monitor, or monitor cable.
Do you have another monitor and monitor cable available to use for a test?

If you have a VGA monitor, (Also known as CRT. Looks like a small TV), most likely the monitor cable does not disconnect.
For this test you would need another VGA monitor with cable.

If you have a flat screen LCD monitor, most of the time the monitor cable is changeable.
You can first use a Known to be good monitor cable, then if this doesn't work, use a Known to be good LCD monitor along with the good cable.

Still no progress?

Then the problem is the computer.
Bad Power Supply. Weak voltage power rail.
One of the leading causes of computer failure.

Also from the symptom stated it matches.

With a Power Supply that has a weak voltage power rail, (Or more than one), you will have enough power to light LED lights, and perhaps spin fans, but Not enough power to turn the Processor on.

1) ALL of the LED lights on at once use less than 1 Watt of power.

2) EACH fan uses 2 to 3 Watts of power.

3) A typical Processor can use from 51 to 125 Watts of power.
Depends on what Processor it is.

This is why the computer may appear to be working fine, but in reality isn't.

Power Supply with a weak voltage power rail will run the Processor for a very short time, then not have the power to keep the Processor on.

How?
Power Supply's used in todays desktop computers are SMPS.
Switched-Mode Power Supply.

There are Electrolytic Capacitors used as Filters in the Power Supply.
They filter the incoming AC electricity, and the outgoing DC electricity to the computer components.

[ Electrolytic Capacitors are in the Input Stage, and Output Stage of a typical SMPS.

1) http://en.wikipedia.org/wiki/Switched-mode_power_supply

2) http://en.wikipedia.org/wiki/File:ATX_power_supply_interior-1000px_transparent.png

You can click on the photo to enlarge.
B shows Electrolytic Capacitors in the Input Stage of this typical SMPS. { Blue and 2 of them}
E shows more Electrolytic Capacitors used in the Output Stage ]

Electrolytic Capacitors can break down. They can operate in a weak stage as they are breaking down, for a small time period. Eventually they break down all the way, and fail.

This is how a Power Supply can work sometimes, then eventually one day it does not.

To explain Electrolytic capacitor break down, and failure:

Typical construction of an Electrolytic Capacitor;

Basic,
Three strips are rolled up tightly together, and inserted into a small aluminum 'can' case.
There is a rubber seal on the bottom of the case, and a seal on top of the case that can break open in the middle.

The three strips are;
1) A Conducting Strip
Thin metal foil usually made of aluminum. This is the Positive strip.

2) A Non-Conducting strip also made of thin metal foil, but has a non-conducting medium applied to it.

3) A paper-like strip that is soaked with Electrolytic Paste.

The Electrolytic paste soaked strip is put in the middle the Conducting strip, and the Non-Conducting strip, and all three strips are rolled up tightly.

At the bottom of the aluminum 'can' case is a synthetic rubber, flat disk shaped seal.
This is called the Bung.

There is a lead, ('Wire') going through the Bung to the Conducting strip. This is the Positive lead.
There is one more lead going through the Bing to the Non-Conducting strip. This is the Negative lead.

At the top of the 'can' case is a flat disk shaped, aluminum metal seal. This seal has an X, or Y shape etched part way into it.

As an Electrolytic Capacitor fails the Electrolytic Paste develops a gas.
Hydrogen gas.
The gas expands inside the aluminum 'can' case, and with enough pressure developed, the seal on top, and/or bottom are compromised.

The X or K shape that is etched partway into the metal disk on top, breaks open, and/or the synthetic rubber disk shape on bottom has one edge pushed out of the 'can' case.

This allows the gas to push Electrolytic Paste out of the 'can' case.
So much paste loss, and the capacitor operates in a weakened state.
Too much paste loss, and the capacitor fails.

Apologizes for the 'Windy' dissertation, but I thought it would be better to know what is going on, than receive a "Replace the Power Supply"

With No processor operating you essentially have No computer.
No computer operating = No Signal to the monitor.
(No video signal)


Need guidance in replacing the Power Supply, or suggestions for a Power Supply so you can compare, post in a Comment. (Believe upper right of your page)

Regards,
joecoolvette

Dec 01, 2010 | PC Desktops

1 Answer

My computer will turn on but my monitor does not get a signal and I've tried this on two working monitors and two different power chords. The lights on the keyboards don't even work. Any solution?


I was just dealing with this last night. My pc would come on, but I kept getting a "No Signal" message on my monitor. I first plugged the machine into a known working monitor. It worked fine so that eliminated the video card issue. Then I plugged the monitor into a different computer...it too worked. So I knew that the monitor was good. I then switched the cord from the faulty monitor and still didn't get a signal. I proceeded investigating the issue. I found that if you boot the machine in safe mode, it actually caught a signal. So...I figured it must be something to do with the resolution. My solution: Boot the machine in safe mode, change the resolution in the control panel and reboot the machine. If it doesnt catch the signal booting in safe mode, I suspect it is a faulty video card. You are likely to find what you are looking for online at zipzoomfly.com or newegg.com

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1 Answer

Monitor and keyboard won't turn on


A couple of things here:

1) The flashing light and signal message indicate that the monitor is functioning but is not receiving a signal from the computer.

2) The memory that you added is liklely to be incompatible with the computer itself and is preventing the system from booting. The computer will perform a selftest when powered on. Normally when there is a memory issue, the unit will beep. In some cases, there will be no action.

Remove the added memory and attempt to boot the system. If it starts up OK, then the memory you have added is the problem.

Update this if you require additional assistance.

Thanks,
Dan

Apr 15, 2009 | PC Desktops

1 Answer

Computer boots up when plugged in,monitor powers down


hi there.......

it is the memory it has to be matched with the actual fsb of the cpu if its slower then it wont switch on.....

and some dell pc's wont work with 1gb sticks so accertain which ram is compatible with the motherboard

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2 Answers

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Could be one of two things:

1. Signal cable from monitor isn't hooked up. (either monitor end or computer case end)

2. Video card in the computer is damaged and not putting out signal. This is unlikely though as usually this will trip the motherboard into beeping when you turn the computer is turned on.

3.

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1 Answer

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how many video cards do you have installed?

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1 Answer

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your monitor is telling you it's on it's last legs..either that or your compaq has a bad video section. either is more vital than a video cable being loose.

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