Why does the computer turn on automatically if the power is not disconnected after it is turned off?

The problem of automatic power on.

There are two main reasons for the failure of computer self-start: one is that the BIOS is not properly set, when the timer boot function is set to Enabled, the machine will automatically turn on at a certain time on a certain date and set. In addition, some motherboards have an auto-turn on function setting in the BIOS settings of the motherboard, and if this function is selected, the machine will automatically turn on when the power is on.

If it is found that it is not the above reasons, it may be a hardware failure, or the power supply itself has poor anti-interference ability, or the voltage is too low, or it may also be the signal quality from the motherboard is poor, and these problems can be solved by replacing the power supply.

The settings of your machine can be checked by following the steps below.

1Check the BIOS settings and set the Restore AC Power Loss of the Power Management Setup in the BIOS to Disabled.

2 If the above does not work, proceed to set PM Control by APM for Power Management Setup to Yes in the BIOS.

Note that this is not the case for individual BIOS versions, please refer to the specific BIOS manual.

You must be using ADSL! You just turned it off, but the power didn't turn off, and your "cat" didn't turn it off.

The problem with your settings will automatically turn on when the outside** calls in. This situation is common in the era of using modems to surf the Internet.

If you don't know how to set it. Just turn off the "cat".

Did you unplug it? If you don't turn off the power completely, this can happen.

Unplugging it solves the problem, and I've seen it before, and it's a Trojan horse.

The best solution is to turn off the power after turning off the computer!

Infected with the virus, you can check and kill. If it doesn't work, your power supply is unstable.

You seem to have turned it on at a regular time.

Detailed analysis of the fault causes and solutions of automatic power off when the computer is turned on

There is a situation that after the computer is turned on, it is not immediately powered off, probably the computer host runs for 2 minutes before the computer host automatically turns off, and immediately press the power button after the computer host will work, but within 30 seconds, the computer host will automatically power off again, and the time to wait for the power to be cut off will be shorter and shorter every time you press the power button, and finally it becomes the situation that the computer host is on and off.

In fact, the computer fault of this kind of computer automatic power off is very good to analyze and judge, we have repeatedly raised the problem of host heat dissipation in the Guangzhou computer maintenance network, if the host heat dissipation is not good, it will trigger the circuit temperature protection of the computer motherboard, when the processor temperature exceeds a certain degree, the motherboard will automatically power off. Because of this, the time to wait for the power to be cut off will be shorter and shorter every time you press the power button, because the temperature of the processor cannot be lowered immediately after the computer is automatically powered off, so if you turn on the computer immediately, the temperature of the processor will rise very quickly, which will trigger the circuit board protection mechanism, until the final situation occurs that it is on and off. If we can solve the heat dissipation problem of the main machine, the fault of the automatic power off of the computer can be perfectly solved.

The computer will automatically power off and shut down after a while, and the following two situations are common:

1. The CPU is overheated and causes power failure.

A. Usually the temperature is high in summer, and a large amount of heat is not discharged smoothly if the computer runs for a long time, the CPU avoids burning itself, and after the temperature reaches a certain limit, start the overheating protection program and turn off the power; Therefore, in summer, it is necessary to increase the heat dissipation method for the computer, avoid using the computer for a long time, and the temperature of the computer operating environment should not be too high.

B. Some computers have been used for a long time, and a lot of dust has accumulated inside the computer, and the dust covers the CPU fan and fan heater, and the fan can not be used to dissipate heat, and the CPU will also start the over-temperature protection and automatically cut off the power when the temperature is too high. Computers and laptops need to be dismantled at least once a year to clean up the dust, and if the environment itself is dusty, then the cleaning frequency should be increased.

c. The CPU cooling fan and radiator are damaged, or the heat dissipation paste between the CPU and the radiator is solidified, resulting in reduced heat dissipation effect and CPU overheating and power outage. When the computer automatically loses power more than 2 times in a short period of time, such hardware problems should be considered, and professional inspection and maintenance should be carried out.

2. The power supply of the computer is insufficient.

a. After the desktop computer upgrades the hardware, the power supply is not upgraded, which may lead to this situation; This kind of situation is more common in early computers, and after some computers change their CPU or graphics card, the hardware power becomes more powerful and the power supply is insufficient.

b. The aging of power supply equipment or the unstable voltage of power supply lines can lead to such situations. Check the power supply equipment of the computer and whether there are high-power electrical appliances on the power supply line.