All we periodically face the problem of "freezing" the computer. Sometimes it causes mild irritation, and sometimes we just want to smash the monitor unfortunate because I do not have time to save what they wrote. What to do If your computer crashed? The reasons for this may be a few. Let us consider each in detail. 1) Unstable hard drive. If the hard drive work have any problems (and they may be mechanical, logical or software and hardware), the computer will "think" for a long time before you commit to any transaction.
Quite difficult to immediately suspected it was slow work hard drive, it can be done only by an experienced specialist the characteristic sound of disc rotation. There may appear on the screen the message "Delayed Write Failed (Windows delayed write failure). 2) Overheating of the CPU. Modern processors produce a lot of heat. Therefore, for their work requires cooling element, generally cooler. When the processor overheats, the system is running slowly, and the computer "freezes". You can check if it works good cooler, just listening, or touching the system unit.
From this will be issued a characteristic noise, and the unit will vibrate. In this case, it is desirable to replace the cooler, then your computer will run faster. 3) Viruses and Trojans. Nowadays, viruses and Trojan horses – this is one of the main misfortunes that can happen to your computer. Whatever form of malware, they are always strongly reduce PC performance. The first thing you should do in this case – to run Anti-virus scanning.
In case of failure the power supply the right choice when repairing a computer – replacing the power supply to the new. However, consider the most frequent causes of failure of power supplies. Computer Services, who has worked for more than 5 years makes the following recommendations: The most likely breakdown of the rectifier diode bridge in the high-voltage circuit. Power supply for such a defect is completely dead: no one from the supply voltage (including the "duty" of five volts), and inclusion – there are no sounds and movements. The reason is determined by any ohmmeter if the resistance between any two terminals of diode bridge is less than 1 ohm and the same in both directions – the bridge needs to be changed. Along the way, need to be replaced and a fuse in such breakdowns it usually burns up the food chain only if the computer was not protected by automatic reactivation fast defense. As a replacement will fit almost any bridge rectifier diodes, or individual, calculated for a voltage above 300 volts and a current of 1 amp, but do not rush to include food – may cause deeper. The second extent of failure – the breakdown of the individual diodes in secondary rectifying circuits.
External manifestations of such a failure – the existence of "duty" of voltage and weak signs of life: when you press the power button once fan twitches, but nothing more occurs. In this case, the actual converter is working normally. Ohmmeter will help you: pierced diode or diode assembly is easy to detect, not vypaivaya at virtually zero resistance in both directions. If you using a multimeter, which allows you to check the serviceability by measuring the diode forward voltage drop, do not be surprised too low value of that of the diode arrays main channels – there are applied Schottky diodes with a fall of about 0.1 volts. Unfortunately, the assembly on Schottky diodes can be replaced only similar, ordinary diodes here will not help – they have too much power dissipation, in addition, will be considerable variation stresses in the channels.
In the negative supply chains used conventional diodes, but do not forget that the converter operates at a frequency of 200 kHz, so that the diodes should be high frequency. Another part of the reason the output of Power failure can be determined visually, these include the breakdown of electrolytic capacitors (rupture of the shell, mostly – at the top) and protective varistors. Capacitors, of course, be changed, and varistors – because they do not there is always the same – you can just vypayat (remembering that the unit is left without protection from the next major power surge). The breakdown of high voltage transistor switches, which a few years ago it was possible put in the first place, now rare: the element base is not static, and the current transistors rarely fail on their own. There are other possible reasons, but for their diagnosis would take at least oscilloscope, and connect with their removal is economically inexpedient. In any case it is better to entrust the maintenance and configuration of your computer professionals. Rely on your PC repair professionals.