1996 Honda Civic DX wont start, when I turn the key all I get is one click?

The car (1996 Honda Civic DX) was fine all day then I get back into the car and go to start it and it seemed as if the battery was dead so I got a jump and found out that was not the problem. Now I get normal power but when I go to start the car all I get is a click. It doesnt crank just a click. And when its in crank position all the power goes off until I realease the key. Can someone please help. I dont know what to do. Thanks.