Power

I have a computer that when I go to turn it on it won’t. At first I thought it was the power supply. I changed power supply and it still wouldn’t boot up. Then I thought maybe I would check the motherboard connectings. When I opened it up I found one of the red and white connects that said power on it and it wasn’t connected. Well I wasn’t sure where it connected so I looked up the motherboard and couldn’t find the specs. It is a intel motherboard with an 810 chipset with FW82810E on the chipset. Well I found what I think might be the specs and put the power connector where it might go on the mother board. To make things simple it still won’t start. The only thing I can think that it might be is the power switch. Any ideas?