Is the computer powered on?

Is the computer powered on?

My computer will automatically start up when I press the switch on the plug-in Board. On BOIS, how can I set it to not automatically power on?
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Press F2 or DEL to start the BIOS setup program, and then select the POWER option, which should have the power loss option and set it to OFF.

There is a "Power Management Setup (Power Management settings)" option in the BIOS of the motherboard, in which you can select the status of the computer when a call is made after an unexpected Power failure, it can be divided into automatic start, shutdown, and pre-power-Off status. You can set automatic start to Off.

After the computer is powered on, it seems that the Forum has previously discussed the issue of automatic power-on after power-on. Now my machine also has this problem. The basic situation of my machine is the dell xps420 quasi system, core 2180 2G memory, 160 hard drive, 7300 video card, motherboard, and electrical source both indicate that the (dell) bios settings in the system have been completed, and the appearance settings have been restored. The power source and motherboard have been changed, this problem still persists. Please advise me.

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There are two ways to enable automatic power-on: the first method is to modify the BIOS settings. The second method is to properly use the power outlet.
1. Modify BIOS settings
Some BIOS settings can cause the above problems. In "integrated phripherals setup", there is a "PWRON After PWR-Fail" setting option to manage this function. There are three options: On, Off, and Former-Sts )". You should set it to "Off ". In this way, the computer will not start automatically when the power switch is turned on or a sudden call is made after a power outage.
My test result On Lenovo benyue 400 commercial computer is: if the above option is set to "On ". When the power switch of the data center is enabled for the first time, the computer automatically starts up. After that, the computer's socket cannot be automatically turned on multiple times. However, after the power switch of the socket is turned Off, unplug the chassis plug from the socket. Then, turn on the power of the socket and plug in the plug to enable the computer to automatically boot. When this option is set to "Off, the fault disappears.
If the above method does not work, you can continue to try the following modifications:
Set "Restore ac POWER loss" of "power managent setup" in BIOS to "Disabled ".
Set "PM Control by APM" of "power managent setup" in BIOS to "Yes ".
Note: For different BIOS versions, refer to the specific motherboard manual.
Ii. Proper use of power outlets
There are advantages and disadvantages in everything, even advanced technologies. The ATX Power Supply provides us with the convenience of soft shutdown, automatic E-mail/Fax reception, and timed startup, however, unstable factors, such as air conditioners and refrigerators, have also been introduced to computers, leading to automatic boot failures. Because the atx structure of the power start is driven by detecting a Capacitive Level signal, and when you press the power socket switch, plug in the chassis power plug, and so on, will generate a short shock current. This can easily lead to the misoperation of The ATX power supply, so that the machine can start up.
Therefore, on the one hand we need to set up BIOS, on the other hand, we should try to make the computer use a separate socket to avoid interference from other appliances. In addition, The ATX Power Supply enables the computer to always prepare for power-on. At this time, the power consumption is very low, and there is no need to turn off the power of the socket. Because its switch will at least affect the life of the monitor.

In fact, this can be said to be a common problem of The ATX motherboard, because the startup of the ATX motherboard needs to detect the level signal of a capacitor. If the power supply cannot be properly connected at a time, it will generate an instantaneous impact current, which may mistakenly mistake the power supply as a boot signal, leading to wrong boot. In addition, in a humid environment, capacitor discharge is faster. When the power supply is switched on, the charging current will be flushed, which may also lead to wrong power-on. Because both power plug insertion and power switch of the wiring board are a process of power-on rather than instant power-on, it is easy to make the power-on status unstable. You can try to directly connect the power supply to the switch with the spring shrapnel, it can ensure that the instant contact is good, the power status is stable, it can solve the problem. Another main board has a function in BIOS, that is, POWER fail state in power management setup (power management setup), AC loss state or pwron after pw-fail, etc, this function can be used to select the status of the machine when the machine is re-called after an unexpected power failure, whether it is automatically started, whether it remains shut down or before the power failure. Set it to off.

From: http://bbs.cfan.com.cn/thread-783955-1-1.html