[My personal understanding of computer startup failures]

Some computer beginners do not know how to start when they encounter problems. Why?
Because they do not know the Startup Process of the computer, and do not know where the fault is ??
I personally think that as a computer user, you should understand the specific process of computer startup,
This helps us quickly identify the cause of computer failure.

The startup time is several seconds, but the computer startup process is still complicated.

When the power switch is pressed, the power supply starts to supply power, and the computer's indicator lights up.
If the computer does not respond at this time, neither the power indicator nor the fan is dynamic, first check whether there are any problems with each line of the computer,
If the line is normal, it may be a computer power supply or a problem with the motherboard, you can open the chassis and use an electric meter to test it.
If there is no problem after the two tests, another possibility is that the CPU is faulty. You can change the CPU to test.

The computer then performs "Post" automatic self-check. The main task of post is to check whether some key devices in the system exist and can work normally, such as memory and video card.
If the system speaker makes a harsh beep at this time, it may be the memory stick or the display card fails. The specific error can be determined by the length and number of clicks.

Next, the BIOS will check the BIOS of the display card, find it, and call its initializationCodeThe video card BIOS is used to initialize the display card.
Then, test the host's memory capacity and display the memory test value on the screen.
In the next step, the BIOS will start to detect some standard hardware devices installed in the system: hard disk, CD-Rom, soft drive, serial and parallel interfaces, and other devices. After the standard device detection is complete
If the hard disk is not installed or there is a problem with the wiring, the BIOS will all error messages, as long as there is a little basic English I believe can understand,
Such as CMOS battery failed (CMOs battery failure)
Cause: the power of the CMOS battery is insufficient. Replace the new battery.

Specific detailed error message, I found a connection for everyone: http://www.pconline.com.cn/pcedu/teach/new/0411/503966.html

The general startup process is like this.

The following describes common software startup errors:

There are many specific causes of software faults. It can be roughly divided:

1: The boot file or system file is lost or maliciously modified,
2: Hard Disk track damage