Beep weather

There are too many cases of turning on the black screen. Common situations are as follows

1.

The computer turns on the black screen, showing that the power supply fan and CPU fan are not moving, the indicator light on the motherboard is not bright, and the computer does not respond. At this time, first of all, you should check whether your power socket is electrified, whether all kinds of power cords are in good condition and whether the connection is normal. If yes, please change the power supply and try again.

2.

The computer turns on the black screen, the power fan rotates normally, the CPU fan does not move, and there is no alarm sound, indicating that the motherboard does not respond. At this time, you should first check whether the power connection socket between the power supply and the motherboard is plugged tightly. If it has been carefully checked, it may be that the motherboard is seriously damaged or the connection between the power supply and the motherboard is damaged. Try to replace a power supply and rule out the second possibility; Please check whether the motherboard is abnormal, such as whether there is capacitor bump (breakdown), whether there is obvious damage on the surface of the motherboard, which leads to the impassability of the line, etc. You can take it to the maintenance station for inspection, and if possible, you can change the motherboard to confirm it.

3.

When the computer turns on the black screen, the power supply fan and CPU fan rotate normally, but there is no display on the display screen and no alarm sound.

At this time, you should first check the problem of the monitor, the connection between the monitor and the computer, the problem of the graphics card itself, or the socket problem between the graphics card and the motherboard when the alarm sound is damaged, and also check the connection problem between the mouse and keyboard (short circuit will also produce a black screen) and various peripherals. So it's best to try the minimum system method first. If the fault still exists after confirming the above situation, please try the following methods:

First of all, I understand the following knowledge: the computer startup process is a very complicated process, and it has a very perfect hardware self-checking mechanism. Within a few seconds of power-on self-test, the computer has to complete more than 100 detection steps. First of all, let's understand two concepts: the first is BIOS (basic input and output system), which is a set of programs that are "solidified" in the computer motherboard and directly deal with hardware. The computer startup process is carried out under the control of the motherboard BIOS. The second is the memory address. In order to facilitate CPU access, each byte of memory installed in the computer has an address.

When the power supply is started, the voltage is still unstable. The motherboard control chipset will send a reset signal to the CPU to initialize it. When the power supply is stable, the chipset will remove the reset signal, and the CPU will immediately start executing instructions from the address FFFFOH, which is within the address range of the system BIOS. Generally, the BIOS puts a jumper instruction here to jump to the real startup code in the system BIOS. The first thing to do in the boot code of the system BIOS is POST. The main task of POST is to detect whether some key equipment in the system exists and can work normally, such as memory and graphics card. If the horn of the system sounds harsh alarm at this time, there may be something wrong with the memory card or graphics card. Specific errors can generally be judged by the length and frequency of alarm sounds. As for what each sound represents, because the related articles have been published many times, I won't elaborate here. Why should errors be prompted by sound instead of being displayed on the screen? This is because the detection process of POST is before the graphics card is initialized, which means that it is still a "black screen" stage, so some fatal errors found in the process of POST cannot be displayed on the screen.

Next, the BIOS will check the BIOS of the graphics card, call its initialization code after finding it, and the graphics card BIOS will find it to complete the initialization of the graphics card. In this process, most graphics cards usually display some information of the graphics card on the screen, such as manufacturer, chip type of graphics card, memory capacity, etc. This is the first picture we see when we turn on the computer.

It is not difficult to draw the following conclusion from the above text: the steps of displaying the first picture on the monitor when the computer is turned on are: supplying power to the motherboard-the motherboard controls the chipset to send a reset signal to the CPU-the CPU starts to execute instructions from the address FFFFOH-jump to the BIOS startup code-post (post)-check whether the key equipment is normal-display the graphics card information, and if there is any problem in this process, the computer will go blank. Judging from the difficulty of the test, we choose the reverse exclusion method to solve it:

Check the key equipment steps, mainly to check whether the memory, graphics card and other equipment can work normally. Here, you can unplug the memory first, turn it on and listen to whether there is an alarm bell. If yes, the previous steps are normal. The main problem lies in memory and graphics card. The problem can be identified by replacement method, and the fault source can also be identified by alarm sound. If the memory is unplugged and there is no alarm when the computer is turned on, you can first make sure that the problem appears in the previous step and do not rule out the alarm sound.

BIOS startup code step: The code in BIOS is stored in cmos, in CMOS.

Save the configuration information of bios, including self-checking program, boot program, setup program, etc. , powered by the motherboard battery. If there is something wrong with the code in CMOS (possibly caused by a virus), it is obviously impossible to boot successfully. In this way, it is necessary to brush the BIOS code again (there are many methods introduced on the Internet). Simply put, remove the motherboard battery, put it back after 5- 10 minutes, discharge the CMOS, and restore the CMOS factory settings.

CPU part: CPU is the control center of the whole computer. If something goes wrong, it is certain that the computer will go black. CPU problems mainly focus on the following aspects: contact problems, poor contact between CPU and motherboard (encountered before), resulting in CPU failure to work; Heat dissipation problem, if the CPU fan is broken or the rotation speed is slow or the silica gel is dry, it will cause the CPU to overheat, resulting in the CPU burning out or overheating protection leading to the computer turning on the black screen; CPU damage: CPU damage caused by various reasons will obviously lead to the problem of black screen when the computer is turned on. You can use the replacement method to determine whether the CPU is damaged.

Motherboard chip part: if the motherboard chip is damaged, the following steps cannot be carried out, and it is inevitable that the computer will turn on a black screen. Chip damage is difficult to detect, and it usually needs to be taken to the maintenance station for inspection. If possible, you can replace the whole motherboard.

4. The computer turns on the black screen, the display appears information, and the computer turns on the desktop and suddenly turns black. This phenomenon is mostly caused by viruses. See if you can enter safe mode (press F8 when starting). If you can, please check your startup items, start the service and start the driver. You can use the method of "Windows Cleanup Assistant +sreng" on this site to remove viruses. Otherwise, the system may have been damaged. Please restore or redo the system (hehe). It is also possible that the unstable power supply causes this problem. Replace the power supply for inspection.

If your machine is like this recently, I'm afraid it has something to do with the weather. It rains every day and some lines are wet. Please blow all the hardware with a hair dryer to see if it is too hot and will burn out.