Where does it not show power? How did you know that?
Is it connected to the Power Outlet?
Does the PSU come on when you hit the power button on the rig?
Lots of unmentioned information here, I could ask you a zillion silly questions before you could come up with an answer like telling us you don't have electricity in the house today.
So please be specific as to how did you come to the conclusion that "motherboard not show power".
What is the stuff that you did before this happened, what all have you connected to the Mobo?
all this stuff you need to tell us before you post a vague question like this.
And for gods sake isn't English the language of primary education in India?