The computer boot host does not reflect the master entering

It is possible that the motherboard is set up with voltage protection, because the voltage in your home is unstable, so it cannot be started.

There may be a power supply problem, this one is very simple, just try it with a good one.

It may be that the motherboard is damaged, so check it too.

1. The hardware is damaged, and there is no way to find a repair.

2 Voltage problems, unstable or too high voltage will lead to failure to turn on, please ask the maintenance personnel to check and confirm.

3 The power supply is not in good contact, change the power supply.

4 If the CPU temperature is too high due to the fan not running, change the fan.

5 Dust problem, there is no other cover to sweep it.

It should be about the same.

The probability of a bad power supply is 60, the probability of a bad motherboard is 30%, and the probability of a bad graphics card is 10%.

1.Let's see if there is a problem with the capacitor.

2.Find a power supply and try it to see if it's a problem with the power supply. The odds are higher.

3.And then there's the motherboard.,And whether it's connected to the line that starts is not in good contact.。

Quite straightforwardly, the power supply is broken. It's good that you change it to another one This phenomenon is a phenomenon of bad computer power supply.

If the power supply is bad, you won't be able to turn on the machine, don't even think about it once

See if there's a problem with the capacitor.

You say the CPU fan is not running. Then you have to change a fan earlier, and if the CPU is pulled to more than 70 degrees, your computer will come back to the BIOS to check your CPU temperature.

Carefully observe the row of capacitors near the CPU for bulging

Well, it's probably my power supply that also made that mistake and changed it to a good one.

1. First confirm whether there is a problem with the pure contact mode of the power supply, that is, confirm whether the plugs are plugged in, if they are not plugged in, that is, there is no power, then it will not be able to turn on.

2. Then we unplug the power cord behind the host, press the power button 5-10 times repeatedly, discharge static electricity, and then plug the power cord back in, and then press the power button to see if it returns to normal. In addition, if the yellow light is on, it means that there is power, so please try to switch the power cords between the main unit and the monitor.

3. When we press the power button, we will generally hear a ticking sound, if not, it is likely to be stuck or the lever is broken, and we need to disassemble and replace one.

4. We also have to see if there is friction in the keycaps, if there is friction, we need to add some lubricant, if it is a problem with the Liang Machang switch, you can swap the switch and the restart switch, open the computer case, find the switch plug and the restart switch plug according to the lead behind the switch panel, and the two plugs can be swapped, but you have to use the restart switch to turn on in the future. Let's take a closer look at the picture to know how to deal with it.

5. Then we unplug the power switch on the front panel and the connection cable of the motherboard, touch the power switch on the motherboard with a screwdriver or a screwdriver, if it can be started, it means that there is a problem with the switch on the front panel. If it doesn't boot, there may be a problem with both the power supply and the motherboard. Generally, when we touch the motherboard, it can basically be booted, and the probability of not being able to boot is relatively low.

6. Finally, we carry out power supply testing, unplug the widest cable plugged into the motherboard, prepare a wire to short circuit the green wire and any black wire, and then plug in the power supply, if the power supply fan is working, then the power supply is good, if it does not work, this is a power supply problem. Replug the power input to the motherboard, turn on and try again, and this problem can often be solved. Rubber chop.

The minimum boot method is used to troubleshoot the problem, provided that the wiring is correct and the card is stable.

Try the boot type (power supply + motherboard + CPU) first.

If it is normal, the buzzer will have an error tone. If it's not normal, it can't start. Or start and stop.

1.Power supply problem: After using the hardware minimum system method, there is no response after booting, and I find that even the detection light on the motherboard is not on. Try changing the power supply.

2.Motherboard problem: The detection light on the motherboard is on, but it can't be turned on, and it smells burned. It is likely that the motherboard's wiring is short-circuited or the chip is burned.

Problem: Generally CPU problems occur due to: overclocking, fan issues, etc.

Passed, and then pilot the bright type (add memory + graphics card + display).

Normally, the ruler will see the display content, pop up the hard disk can not be detected, keyboard and other prompts, you can enter the BIOS, and the buzzer has no abnormal sound. If it is abnormal, the monitor does not display (or the screen is blurred) or the buzzer has an abnormal sound.

1.Memory issues.

The memory itself is a problem: it doesn't work in any slot, not on other machines. That is only to change the memory, and the buzzer will generally have an abnormal sound;

Memory compatibility issues: other machines can be used, but this one can't; Or a single root can be used separately, but two roots cannot be used. Change memory.

2.Display graphics card issues.

Connection problems: check whether there is a broken needle or short circuit;

The graphics card is damaged; The display is damaged (very unlikely).

Through the light type, try to enter the system type (add hard disk + keyboard), this time is actually a complete computer, only the optical drive, floppy drive, printer, TV card, mouse, camera, network card, handle and other peripherals are not plugged in.

The normal state can enter the system. If the trap is not normal, it will show the hard disk and keyboard cannot be detected. It may also reboot or freeze in the process of entering the system. The premise here is the hard disk after formatting and reinstalling the system.

Keyboard problem: This can generally be replaced to find out if the keyboard is damaged, or whether the interface is damaged.

Hard drive problem: It is recommended to test the bad sector condition. At this time, it is generally a physical bad sector. If you can't fix it, think about exporting the data and then get a new hard drive. 9

It is recommended to subtract the inverted operation: enter the system type - light type - start type.

Take out the memory and use the eraser to use the gold finger, which is where the light is in contact with the motherboard, and it is not possible to erase the graphics card.

Is the display not responding?,If the host can turn on, the display screen has been black, either your display is broken, or the graphics card of the motherboard is broken or loose.。

Check the cables between the monitor and the main unit, as well as the monitor and the power supply, and after confirming that there is no problem, remove all the cables behind the main unit and open the side cover of the case.

1. First determine the location of the memory and graphics card connected to the motherboard, as shown in the following figure:

2. Remove the memory and graphics card from the motherboard of the computer. When taking the memory, break the buckle of the memory to both sides, and then pull the memory up;

3. When taking the graphics card, first unscrew the gong nails installed on the back of the graphics card, unplug the power cord of the graphics card, and then pull the graphics card up;

4. Clean the slots of memory and graphics card with a small amount of anhydrous alcohol (containing ethanol), leave it for a while or use a hair dryer to dry.

5. Blow dry and restart to solve the problem.

After the computer starts, the host computer is also normal, and there is nothing to do. It's just that the display doesn't light up, what's going on. It is normal to change to another computer monitor.

There is no bad computer after starting, the power supply, processor, graphics card fan and the indicator light on the motherboard can rotate and shine normally, and the system self-test is normal when it is turned on, and there is no alarm sound, but the screen of the monitor does not have any display, and the display indicator is yellow. When we encounter this kind of problem, we usually have to check it with a substitution method first. Replace the accessories on the faulty computer with the memory, graphics card, processor, motherboard and other accessories on another working computer in order, but none of them can solve the problem, which means that the problem is not in these accessories.

The possibility of damage to the display itself is relatively small, if it is caused by the problem of the display itself, then there should generally be some signs in the use before the failure, such as unstable display, flickering, blurred screen or color cast. If this monitor has had such a fault phenomenon before, you can ask a professional maintenance staff to inspect it. It may be that there is a problem with the power supply or the power interface is not in good contact, try to replace a power supply, if the fault disappears, it means that the problem is in the power supply, if the fault still exists after replacing the power supply, then it may be that there is a problem with the micro switch that controls the power supply.

The problem of micro switch is often ignored by us, but because we often have to press it, it is easy to appear after a long time, especially in some inferior chassis, this phenomenon is particularly common. Remove the front panel of the chassis with a screwdriver, carefully check the power supply and reset micro switch on it, especially the reset micro switch, and see if the two metal DAN pieces inside the micro switch are leaning together due to the loss of danness, so that the micro switch has been in the reset state, resulting in a short circuit, which causes the failure of the display without display. If it is a micro switch problem, you can take it and buy a similar micro switch in an electrical store to reinstall it.

Generally, it is caused by the frequency setting of the display,Right-click on the properties on the desktop,Then set - advanced - jian viewer,Generally, it will not flicker if it is set to 75hz or more,See if the value is less than 75hz,It is best to set to85Hz,Then the visual effect will be better。 If it's not the topic here, then it may be the cause of the voltage instability, if the voltage is also stable, just see if the display is too old and malfunctioning.

The first: it may be that the connection between the host and the display is not well connected (especially the interface is not plugged in or loose), and there may be a problem with the data cable of this connection, so there will be no signal input to the screen, no display, black screen, but the host is still running normally, the solution is to re-plug the connected data cable.

The monitor signal cable is plugged in tightly, and the excuse is whether the needle is broken, the needle is crooked, and try to change it.

In one case, there is no "beep" sound when the host is turned on, if not, there is a problem with the host, check your CPU.

How is this the problem? See if the cable is connected, open the case shell, find the memory module and unplug it, if you don't understand, press the host as long as it is conspicuous, and try to solve it.

Maybe the power supply is finished.

If there is no reflection at all.

Start with the motherboard.

You can check the motherboard or power supply.

Check the plug socket first if there is a problem.

Then check if there is a problem with the computer's power supply.

Check the power lines.

Generally, the machine does not have a reaction light and does not light up, and there is a high possibility of power supply problems.

Your fault phenomenon is not clear enough, so I will give you several situations and judge them after referring to them.

1. After pressing the power switch, the power supply fan rotates normally, the power light is on, the screen is black, and there is no alarm. The point of failure is that the motherboard or CPU is not working properly.

2. After pressing the power switch, the power supply fan will no longer be powered on after only one turn, the power light will not be lit, the screen will be black, there will be no alarm, the fault point is a short circuit, and the overload protection will be automatically turned on when the computer finds that there is a short circuit.

3. After pressing the power switch, the power supply fan rotates normally, the power light is on, the screen is black, and there is an alarm, then there is a hardware failure in the motherboard CPU, graphics card or memory outside the power supply, BIOS and other accessories.

4. After pressing the power switch, the power supply fan does not respond, the power light does not light up, the screen is black, and there is no alarm, then it can be determined that the power supply is not working, not powering on or the power supply is faulty.