Why, when you start the computer, not the monitor turns on

By | 10.12.2018

Why when you start the computer does not turn on monitor

Almost all users do not know – the computer turns on, monitor does not turn on. Occur a similar phenomenon may for a variety of reasons.

The case can be in any of the previously installed apps, drivers. Or just a failed hardware – a video card, the display itself.

Hardware malfunction

Very often the reason that computer works, but does not show the monitor is the hardware.

Most common faults that lead to such situations are as follows:

  • failure of the graphics card;

    Почему при запуске компьютера не включается монитор

  • not suitable voltage;
  • the signal does not reach the data cable from PC to screen.

The failure of the video card

In case of failure of video card a computer can be included, but the image on the screen will not. The reason is the absence of a corresponding signal. To check if everything is fine with the video card, quite simple.

To do this:

  • to see it visually;
  • try to install in another PC.

It often happens that after assembling the PC, the wizard does not check individual components. Sometimes the video card is not fully inserted into the tire. This might be the reason for the absence of a signal at its output terminals. So you should pay attention to its appearance.

Почему при запуске компьютера не включается монитор

Also a symptom of its failure can serve swollen capacitors (the little bars on the Board).

If visually everything is in order, you can try to install it in another PC. Another way of checking the display to try to connect to another personal computer. Perhaps, the case in itself and requires repair. In both mentioned above cases it is best to consult a qualified professional for repair.

The lack of power on the monitor

Before a device of this type connects directly to the power supply of the PC. Those days are gone and today the display is inserted into the socket separately, and there’s a special power cable with a plug on the end.

There are often situations when the monitor is connected to the network, but it is not included. In this case, you must verify the integrity of the power cord, to ring his unit. Of course, disconnecting the pre from the power outlet.

Почему при запуске компьютера не включается монитор

If one lived simply torn off, you should not perform repairs to do the twist. This subsequently may cause injury electrical shock. The most important symptom of the lack of power on the monitor or complete failure is not a burning light bulb, located directly on the housing.

The signal comes via cable data

Often the answer to the question: «why when turn on the computer screen does not work?» lies in the absence of the input signal.

This arises in the following cases:

  • faulty data cable;
  • poor contact in the connection area.

Почему при запуске компьютера не включается монитор

Sometimes it happens that the cause of the idle display lies in the connection cable. It can be simply broken, crushed. Not rarely it happens, when it put the sharp legs of furniture – tables, chairs. Or just too much bend it, breaking the thin strands.

A malfunction of this type is a momentary on for 1 second – when you stir it.

To repair the data cable does not make sense – this process is quite difficult. Best to just buy a new cable at the store, the cost of such goods is relatively small.

Почему при запуске компьютера не включается монитор

Often after replacing the video card or just after cleaning the innards of a PC, the user is not very gently inserts the connector of the data cable into the socket on the adapter. Causing the signal to the screen does not reach and for this reason the picture on it is completely absent. To avoid such situations, it is necessary to tighten the connection of the special screws on the plug.

Software malfunction

In addition to the purely hardware problems no images can be related to the software part.

The most common cause of such faults is:

  • the driver is not suitable or incorrectly mounted;
  • any additional utilities installed.

The main sign that the problem of lack of image is the software of the personal computer is available when run on a display screen of an image and its disappearance with the operating system.

Video: Black screen


For the operation of the adapter and the device to which it transmits the image, you must have special instructions. They are specialized software products that are installed by the user. Often the reason for the failure of the PC screen is a problem with the drivers.

Their causes may be several:

  • the lack of updates.
  • incompatible screen instructions, and video cards.
  • it was established standard software.

Most often the problem lies in the fact that PC drivers are outdated, because the equipment stops working.

To resolve this fault is quite simple, you can go two ways:

  • download self-updating from the official website of the manufacturer of the equipment;
  • go to «safe mode» (press F8 at startup) and perform the following steps:
    • o go to «device Manager» («start»->»control panel»);
    • o find «monitors» and double click on the idle device;
    • o select «driver»->»refresh».

      Почему при запуске компьютера не включается монитор

When connected to the Internet the update will be performed automatically, user interaction is not required. If the screen does not work in safe mode, then you must use another display.

It also happens that there are any compatibility issues between programs the adapter and the PC screen. Most often, these are found already after their installation.

To avoid such a situation, it is necessary to closely monitor changes on your PC. And before you install any catalysts or similar products, make a point to roll back.

In most modern operating systems «sewed» standard drivers that allow you to not spend time installing native. In most cases, it’s quite convenient solution. But some models require the installation of only «native» tools.

If the PC screen does not work after the start of the boot, should go to Windows «protected mode» and to install other drivers.

Performs the indicated operation in the following way:

  • click on «start»;
  • find the «control panel»->»task Manager»->»monitors»;

    Почему при запуске компьютера не включается монитор

  • select the desired device and click on it twice;
  • go to the tab «driver»;
  • click «delete».

After that, you need to run the installation of native drivers, to activate the system «plug & play». This function in automatic mode sets the default set of instructions. After completing all the steps above, you should perform the restart.

Applications and utilities

It happens that the reason for the lack of images are previously installed programs and utilities. Often many users are experimenting with the new software, various utilities. They can negatively affect performance. In particular, the operation of the display.

If after installing any new software, the image is gone, you should remove it via safe mode.

When this action fails, you can use the «system restore»:

  • open the «start» button;

    Почему при запуске компьютера не включается монитор

  • click on «all programs»-> «service»-> «system restore»;
  • follow the prompts, indicated by the operating system.

In the absence of the image on the display is not necessary in any case to panic. Often to eliminate this kind of problem is quite simple, expert help may be required in any emergency situations – they happen very rarely.

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