Windows cannot start normally

When the computer fails to turn on, there are many factors causing it. Some are blue screens, and some are unresponsive when turned on. You must check them one by one according to the actual situation. The following is organized Learn about the reasons why the computer won't turn on and how to deal with them.

Many times the computer will not turn on for no apparent reason. The specific problem is that after turning on the computer, the power light of the host is on, but there is no display. There are many reasons why the computer cannot turn on normally. Here are some simple solutions to solve the problem of the computer not turning on.

Situation 1:The most common troubleshooting methods for computers that do not respond when they are turned on

The most common causes of computers that do not respond when they are turned on are: the computer host power cord is not connected properly, and the monitor switch Not turned on, the monitor power supply or monitor data cable is in poor contact.

When we find that the computer does not respond when it is turned on, we need to first observe whether the computer's power indicator light is on after pressing the power button. If the power indicator light is not on, then there is probably a problem with the power supply. , you can check whether the host power cord is connected to the external power supply, whether there is a line fault, etc. When the computer power supply is poor, the computer will not respond when it is turned on. These need to be confirmed by doing some simple troubleshooting. When the computer indicator light is on and the CPU fan inside the computer is running normally, generally speaking, it can be initially judged that there is no major problem with the power supply. Let's check the monitor to see if the monitor power indicator light is on and whether the monitor data cable is well connected. At the same time, observe whether the computer keyboard and mouse indicator lights are on. Generally, if there is no problem with the host, the computer keyboard indicator light and mouse indicator light are on normally. In this case, the problem often occurs on the monitor, such as the monitor switch is not turned on. , the monitor data cable is not connected properly, or the monitor power supply is faulty, etc.

Situation 2:The computer does not respond when it is turned on due to computer failure

How to troubleshoot the problem of no display when the computer is turned on. (No alarm sound)

Step 1: First check whether the external wiring of the computer is connected properly, and re-plug each connection to see if the fault is eliminated.

Step 2: If the fault persists, then open the main case and check if there are any excess metal objects in the case or a short circuit caused by the deformation of the main board. Smell whether there is a burning smell in the case and whether there are any traces on the main board. Burnt chips, whether the capacitors around the CPU are damaged, etc.

Step 3: If not, then clean the dust on the motherboard and check whether the computer is normal.

Step 4: If the fault persists, unplug the Reset line and other switches and indicator light connections on the motherboard, and then use a screwdriver to short-circuit the switch to see if it can be turned on.

Step 5: If the computer cannot be turned on, then use the minimal system method to unplug the data cables of the hard disk, floppy drive, and optical drive, and then check whether the computer can be turned on. If a startup screen appears on the computer monitor, the problem is among these devices. Then connect more than one device to the computer one by one. When a certain device is connected, the fault reappears, indicating that the fault is caused by this device. Finally, focus on checking this device.

Step 6: If the fault persists, the fault may be caused by memory, graphics card, CPU, motherboard and other equipment. Then use the plug-in method, swap method and other methods to check whether the memory, graphics card, CPU and other devices are normal. If there is any damaged equipment, replace the damaged equipment.

Step 7: If the memory, graphics card, CPU and other devices are normal, then discharge the BIOS, use the isolation method, place the motherboard outside the chassis, and connect the memory, graphics card, CPU, etc. for testing. If the computer can is displayed, then install the motherboard into the chassis and test until the cause of the fault is found. If the fault persists, the motherboard needs to be returned to the manufacturer for repair.

Step 8: There is no display but an alarm sound when the computer is turned on. When the computer is turned on, the system BIOS starts POST (power-on self-test). When a fatal error is detected in a device in the computer, The control speaker will sound an error report. Therefore, there may be a problem that there is no display and alarm sound when the power is turned on. For problems with no display and alarm sound when the computer is turned on, you can check the faulty device according to the meaning of the BIOS alarm sound to eliminate the fault.

Situation 3: No display at startup (divided into no display at all and alarm sound) No display at all:

Is the power supply working?

To determine whether the power supply is working, you can check three places:

1. Whether the cooling fan on the back of the power supply is not spinning. Note: If the power supply is broken, its cooling fan will definitely not spin, but it is also possible that the fan itself is broken, so you should also check other places to determine whether the power supply is broken.

2. Is the POWER indicator light on the computer host panel off? Note: The LED indicators on the computer host indicate the working status of the power supply, hard disk, and floppy disk. If these LED indicators do not light up, it is likely that the power supply is not supplying power.

3. Can you hear the working sound of the floppy drive, hard disk or optical drive during startup? Note: The computer will check these hardware devices when starting. If you cannot hear these sounds, it means that the power is not supplied to them at all.

If you are sure that the power supply is not working, don’t think that the power supply is broken first. You can check the following places:

1. Check whether the main switch has tripped and whether the plug is loose. If an extension cord is used, check whether the fuse of the extension cord has blown out.

2. Whether the power supply stops supplying power due to a short circuit: Since the power supply itself is designed to detect short circuits, it will automatically cut off all power supplies when it detects a short circuit in the output circuit. Therefore, the power supply does not work. This situation can be seen from the operation of the cooling fan. If the power supply is good and there is a short circuit somewhere inside the host, when the power is turned on, you will find that the fan stops after turning and makes a hissing sound. , if the fan rotates a few times after turning off the switch, this symptom is a typical short circuit phenomenon. To find out the component causing the short circuit, you can unplug all the DC output connectors from the power supply. If the short circuit disappears after all the connectors are unplugged, it means that the circuit of a certain component is short circuited. You can Insert the connectors back one by one until the short circuit occurs again, then you can confirm that the component is broken and replace it. Please note that the power must be turned off before unplugging and plugging connectors to avoid burning computer parts.

3. Is the DC output of the power supply normal? If the above three points have been checked and the power supply still does not work, you can use a three-purpose ammeter to measure the DC output of the power supply. If it is There is no output at all, which means the power supply itself is broken. Replacing the power supply should solve the problem.

Situation 4: The power supply is normal but still silent

Problems with the monitor itself

If the power supply is normal and the host panel displays the All kinds of LED indicators are on, especially the hard disk indicator lights are flashing, indicating that the computer has started normally, but the monitor has no display at all, and no alarm sound from the speaker is heard. Please check the monitor at this time. Check whether the power switch of the monitor is turned on. You can check whether the power indicator light on the monitor is on. If it is not on, it may be that the power cord of the monitor is not connected properly, or the power switch of the monitor is not turned on at all. If the indicator light is on, please check whether the brightness and contrast of the monitor have been adjusted properly. If the brightness of some monitors is adjusted to the lowest level, it will be completely black. Of course, the monitor will not display fully at this time. If the problem persists, you can borrow a good monitor to determine if your monitor is broken.

CPU problem

If there is no problem with the power supply and the monitor itself is good, but there is still no sound or video, there may be a problem with the CPU, which includes whether the CPU Plug it in (the direction of the first CPU pin of SOCKET 7 is incorrect or the CPU is not fully inserted), the overclocking is too aggressive, the frequency is adjusted too high, and the CPU cannot run at all, and the CPU core voltage adjustment is out of range. If you have solved the above problems and still cannot start, it may be that the CPU itself is broken. Try another CPU.

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