Power Switch:

[glaxi]

Hello Everybody

I have a motherboard. When Press the power button motherboard is nor turn on. I check the power supply and any thing but mother board not turnon

 

[alaricljs]

Could be the power switch, the wires to the power switch, the motherboard, the power supply, something else plugged into the PSU that's shorted, or the circuit breaker that the plug on the wall is plugged into.

How did you check the power supply? Unplug everything attach some fans and short pins 16 and 17 to tell it to power on. (pins only correct for 24 pin ATX).

 

[Harvey]

alaricljs's post lists pins in a new standard used by makers of some pre-built machines (HP, Gateway, etc.) for the header where the wires from front panel switches and LED's connect to the motherboard.

Check the manual for your motherboard to find the pair of pins for the front panel power switch, and be sure you have the right wire pair connected to the right pins on the header. The power function works by momentarily shorting those two pins. You can use a screwdriver or other metal object to do the same thing to test whether it's working. If the machine starts when you do this, but it doesn't start when you connect the switch to the same pins, the switch, the little two pin connector or the wire pair is bad.

Good luck.

 

[alaricljs]

alaricljs's post lists pins in a new standard used by makers of some pre-built machines (HP, Gateway, etc.) for the header where the wires from front panel switches and LED's connect to the motherboard.

Er, say WHAT? I'm talking about the pins on the 24 pin PSU connector that would normally feed power to the motherboard. Hence stating that you need to unplug everything. pin 16 on standard 24 pin ATX PSUs is the pin that the mobo power button connector routes to. Shorting it to a ground pin (17 or any other black wire) will tell the PSU to power on. Some PSUs need a load, hence the fan recommendation.

http://www.motherboards.org/images/articles/guides/24-pin.jpg

 

[Harvey]

Er, say WHAT? I'm talking about the pins on the 24 pin PSU connector that would normally feed power to the motherboard. Hence stating that you need to unplug everything. pin 16 on standard 24 pin ATX PSUs is the pin that the mobo power button connector routes to. Shorting it to a ground pin (17 or any other black wire) will tell the PSU to power on. Some PSUs need a load, hence the fan recommendation.

http://www.motherboards.org/images/articles/guides/24-pin.jpg

Oops. My mis-reading of your post. I was referring to the header where the front panel power switch, LED's, etc. connect to the motherboard. The ready-made box companies have their own standard that gets in the way of using other makers' motherboards in their chassis.

My post is still correct about shorting the two pins used by the front panel switch. Sorry for any confusion.