Why can t I turn it on, why can t I turn it on?

There are many cases where the system cannot be turned on, and generally speaking, there are probably several hardware reasons that cause the system to fail to boot.

1. The power supply of the computer fails, resulting in the inability to supply power to the host normally. This is usually manifested by the main engine power supply not lighting up.

2. This kind of failure is generally caused by poor contact between the memory module and the motherboard memory slot, and the memory damage or the motherboard memory slot problem will also cause this kind of failure. There will usually be a continuous long tone alarm.

1. You can hear a "tick" sound when you turn on the machine (normal startup sound); If the host boots normally, if it is not displayed, check whether the power supply is normal. Check if the cable is loose (if the motherboard has an integrated graphics card and a discrete graphics card, check that it is plugged in correctly). Check if the graphics card is loose or oxidized, and reseat it (or the memory if the graphics card is integrated).

Second, you can't hear a "beep" sound when you turn it on; Explain that the fault lies with the host, open the chassis and check.

1. Power on, if the power supply and CPU fan are running normally. It may be that the memory is oxidized. Solution: Disconnect the host from power, unplug the memory, wipe it with an eraser and plug it back in. (If you have a discrete graphics card, check the discrete graphics card in this way).

2. After powering on, the CPU fan does not rotate; It may be that the motherboard has a power supply failure, check for leakage or bulging capacitors. If not, the fault is more hidden, please check it by a special person.

3. After powering on, the power supply fan does not rotate; First, check whether the power plug is loose. If the plug is normal, disconnect the power plug, connect the "green wire" and "black wire" holes of the plug with a paper clip or wire, and then connect the power supply. If it does not turn, it means that the power supply is broken, and replace the power supply.

There are many reasons why you can't turn on the machine, you need to check them one by one, you can charge it for half an hour first, try to see if it can be turned on, if it can't be turned on, it may be a hardware or software problem, and you need to take it to a repair shop to test.

Error check cable connection Check the cable connection Is there any wire in it is not good Desktop disassembly to take a look Generally, the D port of the hard disk power supply is plugged crooked, and the notebook is recommended to be repaired.

Why can't I turn on the machine, I think about why I can't turn on the machine, maybe it's out of power, or it's broken, right?

Either the battery is out of power, or the phone is broken.

In fact, there are many reasons why it can't be turned on, such as no power and memory sticks, which need to be checked one by one, if there are no problems, you need to take it to the repair shop to check.

The old computer, there are all kinds of problems, you rebuild the system to guide it.

There may be bad channels on the hard drive.

1. The method is as follows.

1. After disassembling the battery, press and hold the power button of the phone for 8-10 seconds to see if the phone can be turned on normally.

2. Remove the SD card and SIM card of the mobile phone, wipe the metal with an eraser and reinstall it to see if it can be turned on normally.

3. Replace a mobile phone battery of the same model for testing.

4. Take out the battery, clean the metal contacts of the battery with an eraser and test.

5. It is recommended to use the original charger to charge the phone for more than 10 minutes.

6. You can reboot the phone to see if the phone logo can appear, quickly press and hold the left function key of the phone when the logo appears on the phone to see if the phone can enter the safe mode, and if you can enter, uninstall the recently installed application in the application manager until the phone is turned on normally.

If none of the above operations can solve the problem, it is recommended to send the phone to the nearest after-sales customer service to test the phone.

2. Expand the information.

About the phone battery.

1. The mobile phone battery is an energy storage tool that provides power for the mobile phone, which is composed of three parts: the cell, the protection circuit and the shell, and the mobile phone battery generally uses lithium battery and nickel-metal hydride battery.

2. "mAh" is the unit of battery capacity, and the Chinese name is milliampere-hours.

3. The mobile phone battery is composed of three parts: the cell, the protection circuit and the shell. At present, mobile phone batteries are all lithium-ion batteries (often referred to as lithium batteries in non-standard situations), and the cathode material is lithium cobalt oxide.

Standard discharge voltage, charge cut-off voltage, discharge cut-off voltage. The unit of electricity is Wh (watt-hour), because the standard discharge voltage of mobile phone batteries is uniform, so it can also be replaced by mAh (milliampere-hour). The conversion relationship between these two types of units on mobile phone batteries is:

Watt-hour = ampere-hour.

4. In the use of lithium batteries, it should be noted that after the battery is placed for a period of time, it will enter a dormant state, and the capacity will be lower than the normal value, and the use time will be shortened. However, the lithium battery is easy to activate, as long as it goes through 3-5 normal charging and discharging cycles, the battery can be activated and the normal capacity can be restored. Due to the characteristics of the lithium battery itself, it is determined that it has almost no memory effect.

Therefore, the new lithium battery in the user's mobile phone does not require special methods and equipment during the activation process. Not only in theory, but in my own practice, it is best to use the standard method of charging this "natural activation" from the beginning.

If it's not that the phone is out of battery, it may be that the phone is stuck and crashed during the buffer process of the manual system upgrade, if it's this, don't worry, wait for a long time for the system to recover before turning it on.