How do you build a computer. please help!!!!?

I have a school project/homework that we've had for a week to build a computer with the parts she gave us and i havent started and it has to turn on to get a A. I tried putting it together several times but it wont work. i lost my CPU heatsink so im trying to build it without one. i put the CPU on the... show more I have a school project/homework that we've had for a week to build a computer with the parts she gave us and i havent started and it has to turn on to get a A. I tried putting it together several times but it wont work. i lost my CPU heatsink so im trying to build it without one. i put the CPU on the motherboard but it wont fit even when i force it on and i dont know where to put the gpu
Update: the gpu is a radeon 2600 pro ATI
Update 2: umm idk you people? you have the wrong person
4 answers 4