A computer is a rather complex device that consists of many different parts. At the same time, specialized programs are installed on it, on which its functioning depends. That is why, when a certain breakdown occurs, it must be considered in the complex of the entire device, and not give an assessment of one detail.
For example, if the monitor does not turn on when you turn on the computer, then there can be many reasons for this, and at the same time, they may not even be connected with the monitor itself. Therefore, in order to determine the real cause of the malfunction, it is necessary to perform a certain sequence of actions, as a result of which a breakdown will be detected.
First of all, if the monitor does not turn on when you turn on the computer , you need to check whether its power cord is connected to the outlet. At the same time, make sure that the outlet itself is also energized.
If everything is in order, and the malfunction is not resolved, then you need to check the connection of the computer to the monitor itself and, in addition, the correctness and quality of the wire connection.
If all of the above actions are completed, and the monitor does not turn on when you turn on the computer, then you must check the monitor itself. To do this, you need to make sure that the power button is turned on, and if no changes occur, then you should connect the monitor to another computer. Thus, it is possible to identify its breakdown.
If the device turned out to be serviceable, and the monitor does not turn on when you turn on the computer, then you need to check the video card. On modern system units, this is quite simple. You must switch the video cord from the video card connector to the integrated video connector on the motherboard. If the monitor works, then the fault is in it. However, if the system unit does not have an integrated graphics card, then you can rearrange the main board to another computer for verification.
If all the actions were performed correctly, and the monitor does not turn on when you turn on the computer, there is a high probability that the malfunction is in the motherboard or power supply.
To check the motherboard, after turning off the power, you need to touch some microcircuits with your hand to detect an elevated temperature. If an overheating element was found during such an examination, then the problem is in the motherboard. If such a part is not found, then you can check the power supply. Typically, the reason is the lack of power on the cooling fans.
When all of the above actions are completed, and the monitor does not turn on when you turn on the computer, the last thing you can do at home is to clean the system unit from dust. It is a good conductor and can cause a short circuit, especially on old or damaged boards.
If an inoperative part was found during this check, or the cause of the malfunction was not found, then you should contact the service center, where the computer will be checked on a special stand, and the inoperative part will be replaced.