The computer does not turn on. Often, this formulation can hide completely different failures and malfunctions. Therefore, before starting to repair a computer that does not turn on, it is important to identify the cause of the breakdown.
The usual procedure for turning on the computer is standard for any operating system. This procedure consists of several steps, one of which causes a malfunction.
Starting the computer starts by including it in the power network. For supplying power to all the chips of the computer is responsible Power Supply (BP). And if the computer does not turn on when pressing the power button on the panel of the system unit, then first of all the BP is checked carefully. However ridiculous it may sound, but first you need to check if the PSU is connected to the network. There are cases when users do not notice that the power supply of their computer is disconnected from the outlet or from the network filter, forget to switch the switch to the PSU in the "on" position.
If the power supply is connected correctly, but the computer does not turn on, you need to inspect"Insides" of the system unit. A certain voltage is applied to certain components of the system even when the computer does not work, but is simply plugged into the outlet. This "standby" voltage, which may be needed to turn on the computer on a local network, for example. Therefore, to check if the power supply is functional, you can by checking the presence of this voltage. The test is performed using a tester. Some modern motherboards are equipped with a special LED that indicates the presence of voltage from the PSU.
After you press the power button on the computerpower is supplied to the "working" voltage and after 0.5-1 s, when the power supply control circuit gives the motherboard a signal on the Power Good line, which means that there is sufficient power. If this does not happen, there may be several reasons: the power button is not working properly or connected, or the power of the power supply unit is insufficient to operate the system, or the power supply unit is faulty.
Check whether enough power, you can,disconnecting optical drives, hard disks and a video card, and then repeating the attempt to turn on the computer. If a BIOS is installed on the computer, then in the case of a breakdown of the PSU, the speaker of the computer will be continuously singing.
If the PSU is functional, then after pressing the power button, you can hear the noise of the starting fans (all) and the characteristic hum of the unwind spindles of the hard drives.
Each power supply unit is equipped with short-circuit protection system. This system automatically turns off the unitshort-circuit power supply. Therefore, you should check this version, turning off the peripheral devices in turn, which can cause a short circuit.
Finally make sure the unit is faultyYou can supply power if you install a known good and more powerful unit into the system. If the system is turned on normally with the replaced unit, then there is no doubt as to who the "culprit" of your problems is.
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