New computer starts to power up before power button is pressed.

[ddeder]

I just built a new computer using a Biostar M7VKS mobo. The only problem I have is this... When power is supplied to the computer (by say turning the surge protector on), the computer immediately powers up for two seconds, fans spinning and all, and then stops. This happens before the power button is pressed. When the power button is pressed, the computer powers up normally. I tried switching the wires that lead from the power switch to the mobo but that did not make a difference. It is really irritating... Anyone know how to fix this or is it a problem with my board?

 

[indianduddawg47]

not a problem with your board, it's your bios - you need to change it to either boot up or stay off after power failure - this should be somewhere in your bios.

 

[ddeder]

I have been unable to find any setting in my bios that fixes this problem. I just sent the following e-mail to Biostar:

I recently ordered four of these motherboard's for my computer shop. I have built two nearly identical systems using this board with a 1 GHz AMD Duron CPU. These computers work great except for one little problem which is happening with both computers. The problem is this:

When the computer is plugged into a "live" outlet such as a wall outlet or an outlet on a surge protector which is swtiched on, the computer immediately "powers up" for just a second and the fans all begin to spin and then it just stops. Note that this happens before the power button on the case is pressed... Once the fans stop spinning, pressing the power button boots the computer normally. Simply switching the surge protector from the off to the on position causes this behavior.

I have tested the power supplies with other motherboards and have ruled out a problem with the power supplies. I have tried reversing the wires from the powerswitch to the motherboard and this did not solve the problem.

I have the following questions:

Is this a known issue with these motherboards?
Is there a bios setting that can be changed to prevent this from happening (I have flashed the latest bios)?
Can this can cause damage to the computer?

If anyone else has has an idea how to solve this problem, please let me know.

 

[Lanyap]

Several of my rigs do this. I think it's normal.

 

[Methos1995]

One of mine does this also. It's an MSI Mobo. I forget which model. I also think it's normal.

 

[Cuular]

The last two or three MSI motherboards I bought do this. It kinda gives me a scare each time when I am building them.

I have trained myself over the years that if the thing powers up automatically then there is a problem somewhere. At some point I just re-trained myself to get used to it with the MSI motherboards.

 

[RickH]

I find it hard to believe that MSI would design a motherboard that you have to unplug the computer from the wall to keep it from turning itself on. Check that you have the 2 wire connection from the case on/off switch on the correct pins on the board. The case switch itself could be the problem, believe it is a momentary contact normally off switch. RRRRRRR

 

[KGB]

This is normal behavior for an ATX system.

 

[jcmoran]

This is normal.
In order for an ATX system to be able to power up the system on it's own based upon the settings in the bios, the system must first have a sense that power is available. When you first provide power to your system it may take a moment for the mobo to register that power is available and when it does it will reset itself and wait to be told to turn on, either by the power switch or by one of the bios settings or timer.
Some bios can be set to turn the machine on at a pre-set time like an alarm clock.

 

[ddeder]

Thanks for the input everyone. I have built many ATX systems in the past, none of which exhibited this behavior. I guess some boards do and some boards don't. In the future I will not consider this to be a problem. Thanks.