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What to do if the computer does not turn on? Power unit
| The computer does not turn on. Often under this formulation absolutely different breakages and malfunctions can disappear. Therefore before to start repair of the computer which does not join, it is important to establish the breakage reason.|
Usual procedure of turning on of the computer is standard for any operating system. This procedure consists of several steps, on one of which there is a failure in work.
Start of the computer begins with its inclusion in power supply network. The power unit (PU) bears responsibility for giving of food on all chips of the computer. And if when pressing the button of inclusion panels of the system unit the computer does not turn on, first of all BP is carefully checked. As if it is ridiculous did not sound, but for a start it is necessary to check, whether BP is connected to a network. There are cases when users do not notice that the power unit of their computer is switched-off from the socket or from the surge protector, forget to switch the switch to BP in the situation "in C".
If the power unit is connected correctly, but the computer does not turn on, it is necessary to examine "interiors" of the system unit. A certain tension is given for some components of system the power unit even then when the computer does not work, but is simply included in the socket. This tension "on duty" which can be necessary for turning on of the computer on a local network, for example. Therefore to check, whether the power unit is serviceable, it is possible, having checked existence of this tension. Check is carried out by means of a tester. Some modern motherboards are equipped with a special light-emitting diode which shows existence of tension from BP.
After pressing of the button of turning on of the computer the power unit "working" tension and later 0,5-1 moves with when the scheme of control of the power unit gives out to the motherboard a signal in the area of Power Good which means existence of sufficient nutrition. If it does not occur, the reasons can be a little: the inclusion button is faulty or is not connected, or the power of the power unit is not enough for work of system, or the power unit is faulty.
To check, whether there is enough power, it is possible, having switched-off optical stores, hard drives and the videocard then having repeated attempt to turn on the computer. If Award BIOS, in a case with breakage of BP is installed in the computer, the speaker of the computer will continuously peep.
If BP is serviceable, after pressing of the button of turning on of the computer it is possible to hear noise of the starting fans (all) and a characteristic rumble of the untwisted spindles of hard drives.
Each power unit is equipped with system of protection against short circuit. This system automatically switches off the power unit at short circuit. Therefore it is necessary to check this version, switching-off in turn peripherals which can be the cause of short circuit.
Finally it is possible to be convinced of malfunction of the power unit if to install obviously serviceable and more powerful block in system. If at the replaced block the system normally joins, doubts in the one who "responsible" for your problems, does not arise.
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