Probably, every user at least once faced with such a situation that the computer does not start. In such cases, if you act according to the algorithm below, then you can easily and quickly detect a malfunction, and in many cases even fix it yourself.
First of all, it is necessary to check the reliability of the connection of all PC cables, if any plug is removed, it must be corrected. Very often, it is the departed connector that causes the system unit to turn off.
If this does not help, move on. If the computer shuts down or freezes after showing the initial splash screen, then the problem is most likely in the violation of the software. You must reinstall the system or restore it from a backup (if any). If you do not know how to do this, then invite a specialist.
It happens that the computer does not start, and there is no reaction to pressing the power button, in this case, most likely, the power supply burned out. In the spare parts store, you can buy a similar one and make a replacement.
It is also possible that the computer does not start and at the same time squeaks. This triggers a fault notification system . You can find out what exactly does not work by using the audio decryption table for your brand BIOS. Based on the type of error, you must first check the power and connection of one or another unit, and then, if necessary, replace the faulty spare part.
It is possible that when the PC starts up, it works for a short time and turns off. This may be due to the activity of virus programs or overheating of the central or graphic processor. In the first case, it is necessary to clean the system in order to remove malware. In the second, it is necessary to eliminate the malfunction of the cooling system. To do this, make sure that all fans (processor, power supply, video card) rotate after starting. If this does not happen, then either there is no power, or the fans themselves do not work, then they must be replaced. Perhaps the problem will be solved by cleaning the system unit from dust and replacing thermal paste.
In the event that you have completed all these operations, and the computer does not start anyway, contact a specialist. When doing independent checks of PC components, do not forget about safety precautions, never disconnect or connect the system unit components when the power is on.
If the PC is still under warranty, you should not do anything on your own except checking the cable connections and reinstalling the system. Take the system unit to the warranty service center, they will find out why the computer does not start and fix the problem completely free if it is caused by the failure of any part through no fault of the user.
It is also worth remembering that most often the computer does not start due to the fault of the user. This is work without anti-virus programs and the absence of equipment such as an uninterruptible power supply unit or at least a voltage filter, irregular dusting and replacement of thermal paste. All these factors increase the risk of your PC crashing.