How many situations does the computer fail to turn on?

1.Excluding poisoning, if the boot is very slow, and it is easy to crash, it is recommended to perform a bad sector detection first (I don't know what you mean by repairing disk bad sectors), generally speaking, serious bad sectors can not even be defragmented! So defragmentation is recommended first!

2.See if there's something wrong with the host's CPU fan? If the CPU temperature is too high, it will also cause the system to crash frequently!

3.If this doesn't work, it is recommended to reinstall the system once, although you said that the virus is excluded, but the system is inextricably linked, it really doesn't work or backup and reinstall the system!

By the way, there is also a leakage, that is, the voltage, if you are in a place where the voltage is unstable is also one of the reasons for the crash, of course, it may also be that your power supply is relatively bad and unbearable!

Hope you can solve your troubles! 1.Excluding poisoning, if the boot is very slow, and it is easy to crash, it is recommended to perform a bad sector detection first (I don't know what you mean by repairing disk bad sectors), generally speaking, serious bad sectors can not even be defragmented!

So defragmentation is recommended first!

2.See if there's something wrong with the host's CPU fan? If the CPU temperature is too high, it will also cause the system to crash frequently!

3.If this doesn't work, it is recommended to reinstall the system once, although you said that the virus is excluded, but the system is inextricably linked, it really doesn't work or backup and reinstall the system!

By the way, there is also a leakage, that is, the voltage, if you are in a place where the voltage is unstable is also one of the reasons for the crash, of course, it may also be that your power supply is relatively bad and unbearable!

1. If the power supply fan is rotating, it means that the power supply is not broken.

2. If there is a sound of dripping when booting, it means that the motherboard is not broken, if there is no sound, it may be that the motherboard is broken.

3. If the CPU fan of the power supply fan is turned on and the machine is not turned on, when you remove the memory module, the system does not alarm, which means that the motherboard is broken, or the CPU is broken.

4. When you remove the memory module, the system will alarm, indicating that the memory module is in poor contact.

5. If the display does not display after booting, it may be that the display is broken, or the graphics card is broken, and if the graphics card is integrated, the motherboard is broken.

6. If there is text on the monitor after booting, it may be that the hard disk is not connected properly, or the boot file is missing.

7. Take a look at your BIOS system, if you plug in the USB flash drive, and the first boot item is started from the USB flash drive, you have to remove the USB flash drive and start it again.

Take your time to find out what is wrong.

In general, one is hardware, and the other is software. If the hardware is fine, then it must be a software problem. Hardware problems can only be eliminated by the software method, and the software needs to be reinstalled in the system.

1.Neither mouse nor keyboard was detected, 2The hard disk is not detected, 3The system is broken.

4.The hardware is broken.

There are too many cases where the boot fails to boot!

There should be two categories: hardware and software.

The hardware is mainly caused by loose memory modules, loose graphics cards, and too much dust on the CPU cooler to dissipate heat.

The software is mainly a system problem, for example, you inadvertently delete the boot file (related files) of the system disk C: There is also the problem of driver mismatch (which generally leads to blue frequency), and there is the problem of viruses

I just encountered it a few days ago.,CPU fuse burned.,The fan is turning.,There's a boot prompt sound.,It's just that there's no response when you boot up.,The display is black!

Poisoned abnormal shutdown ......

My suggestion is to reinstall the system.

The computer can't turn on is generally the following phenomenon:

1.Press the power button and there is no response - check the external power supply first, no problem and then see if the motherboard is powered on, there will be LED lights on the motherboard;

2.The motherboard does not turn on when it is powered on - it is usually a problem with insufficient power supply and switching wiring. If conditions permit, use the meter to measure;

3.There is no signal from the fan to the display, and there is no alarm from the host, which is mostly a memory problem, followed by the graphics card. If there is a problem with the graphics card, it will call the police;

4.The above three are fine, and the display screen has a small dot that keeps beating Not only the slippery system, but the electric repentance chain brain does not recognize the system file. It is usually a system damage or a faulty hard disk data cable.

There can be a number of reasons why your computer won't boot properly, but here are five possible answers:

1.Power supply issues: First, check that the power plug is properly connected to make sure the power cord is not damaged. You can also try using a different power outlet or replacing the power cord to troubleshoot the power issue.

2.Hardware failure: It could be a hardware component failure, such as a memory module, hard drive, or graphics card. Try replugging the memory module and cleaning the connector, or connect the hard drive and graphics card to a different computer to test to determine if there is a hardware issue.

3.Software conflicts: Some software conflicts or operating system errors can cause boot issues.

Try to start your computer in safe mode, and if it boots normally, it might be a problem with one of the installed programs or drivers. You can try uninstalling recently installed software or updating drivers to resolve the issue.

4.Overheating issues: If your PC overheats, it can cause startup issues. Make sure that the ventilation core of the calculator is well closed, clean the radiator and fan, and replace the dry thermal conductivity adhesive in time.

5.Motherboard failure: If none of the above methods work, the motherboard may be faulty. This may require a professional repair technician to diagnose and fix.

To sum up, the reason why your computer won't turn on could be a power issue, a hardware failure, a software conflict, an overheating issue, or a faulty motherboard. Depending on the specific cracking, ruling out these possibilities one by one can help solve the problem. If you can't solve it on your own, it is recommended to seek a professional computer repair service.

1. See if it is caused by poor line contact. The solution is relatively simple, we only need to check whether each connection cable is normal, unplug and unplug the cables, and then try to start the boot.

2. If there is no problem with the power line, then it may be that the memory module is damaged, we cut off the power supply, open the back cover, take out the memory module to see if there is a problem with the gold finger, use an eraser to check the position of the gold finger, then plug it back in, and then turn on the power to try if it can start.

3. If it's okay, it may be a system problem, or a virus in the computer. The solution to this situation is relatively simple, just reinstall the system.

1. Common reasons why the laptop cannot be turned on.

1. Power supply problems.

If it is an external power supply, first see if the power supply is not plugged in properly or there is a problem with the plug. If you are using a battery, it may be that the laptop power supply is running low.

2. The motherboard is faulty.

Motherboard failure is the main reason why laptops won't turn on. It is often caused by factors such as liquid ingress of the notebook, breakage, and damage to the components of the motherboard itself.

3. Circuit failure.

In addition to artificial liquid ingress and short circuits, most of the failures of laptops that cannot be turned on are problems with the protection isolation circuit, the failure of the boot circuit and the EC peripheral circuit, and sometimes the circuit will be burned out in a large area.

4. BGA failure.

BGA failure is also a failure caused by the laptop not being able to turn on, which is extremely common in notebooks that use DBM as the South Bridge chip in the Swift Relaxation generation.

5. If it cannot be solved, it is recommended to send it to the after-sales center for maintenance.

Analysis: Sometimes the computer boot can not enter the system is generally caused by software or hardware failure, the reasons are many and very complex, it may be system file corruption, it may be virus infection, or it may be a problem with the graphics card or memory.

1.Restart the computer, if you can enter the system normally, it means that the last time it was only an occasional program or system error, it does not matter.

2.If you can't enter the system normally frequently, press F8 immediately after booting to see if you can enter the safe mode or configure the correct mode for the last time, if you can, enter and exit, and then restart to enter the normal mode. If you have security software, you can use 360 Security Guard and 360 Antivirus in safe mode to check and kill all the things.

3.If not, press F11 after rebooting to see if there is a one-click ghost, and if there is, a one-click restore (I used to do a one-click backup).

4.If there is no one-click restore, use the system USB flash drive to reinstall the system. After booting up, press the del key (notebooks are generally F2 or according to the bottom line of the screen prompt characters) to enter CMOS, and set the U disk as the first boot item.

Reboot into the boot menu of the USB flash drive, select Clone Installation, and then follow the prompts.

Upstairs is already detailed.

There are a few more points I would like to add.

1.The memory is damaged or the metal socket is embroidered (rubbed off with a eraser) 2Corrupted optical area (boot the BIOS to the hard drive).

If the host is normal, it's a matter of the graphics card, open it and try to plug it in.

There are many reasons for the lack of reliable connection between memory, CPU, graphics card, and hard disk, and it is recommended to find a professional to repair it.

Desktop PCs sometimes boot and sometimes don't, and that's most likely for three reasons:

1) It is the main reason: it may be that the memory and the memory slot are in poor contact, or the graphics card and the graphics card slot are in poor contact, so when the thermal expansion and cold contraction.

As a result, sometimes it can be started and sometimes it can't. Here's how to deal with it:

You can turn off the power first, turn on the compartment, dial out the memory, and use the eraser to the gold finger.

The part (that is, where there is a copper sheet,) rubbed back and forth a few times, and then inserted back into the memory slot (or inserted back into a memory slot), it's OK, if there is a separate graphics card, you can also use the same method to deal with the graphics card, and then insert it back into the graphics card slot, and finally install the machine, restart the computer It's OK, (take the memory ** as follows:)

2) There is a problem with the power supply of the host, such as the virtual welding of the internal components, or the leakage of the filter large capacitor, when the solder joint contact is good, it can be started, when the solder joint contact is poor, it can not be started, when the large capacitor leakage is less, the computer can be started, when the leakage is more, the computer can not be started, generally encountered in this phenomenon, only the power supply can be repaired or replaced.

3) There is a problem with the switch key of the desktop computer, and the contact is poor, so sometimes it can be turned on, sometimes it can't be turned on, and the switch can only be replaced, or the switch plug-in wire of the restart key can be replaced by the pin wire of the switch key.

Protect your PC in real-time.