[y2161994]

Hello friends,
I was confused because when we start our pc we press start button.But again we press start button pc will shutdown.
So my confusion is why that button serves dual work at different situations?????


Thanking you...

[hlx]

It is a power button. It serves both purposes.

Computers employ a functionality called ACPI (Advanced Configuration and Power Interface)

A part of this technology figures out if you have just pressed the power button in once (shutdown) or held it in for more than 5 seconds (power off)

If your computer is older, lacks this technology, or is turned off in the BIOS, your computer will shut off immediately when you press that button.

I hope this has been helpful, and if not, please clarify your request.

[no2pencil]

When acpi was released, & the world switched from AT to ATX power supplies, all power switching is handled through the bios rather than hard on/hard off. I believe it's called double-throw-double-pull?

calvinthedestroyer could explain it better.

** edit **
I got ninja'd