Everything is hooked up best I could find online and in the manual.
The DVD player and HD I plugged in beside each other.
I only put the Power button on the 10pin panel. Rams in. Powers connection. Cpu fan is connected. Green light comes on but when I press the power button it doesn't make any noise just the cpu fan spins for 2 seconds then stops
That would stop a boot lol, Your PS DOES have that one, It may be a 8 pin actually, The 8 pin for the GPU will be a 6 pin with 2 on the side to use as a 8 pin, That one will be 2 4 pin plugs side by side, Many MB's use the 8 but yours is using just the 4 but it IS on your PS, That I'm confident of.
You don't need a reducer or adapter or anything - the pin slots are keyed, so it will only plug in one way. Just plug in the ones that fit, and it's fine. There'll be extras hanging off, but it won't affect anything.