Remove everything but CPU and PSU connections! Then add one item at a time if it powers up.
Well as embarrassed as i am to admit it,
When I took your advice and plugged all internals out, and started just with motherboard/cpu
I realized that the motherboard/psu connector was the wrong way round
Though i know these things are keyed, I thought just to work on 180 degree direction over the other.
I did not realize that only one side is actually compatible with the PSU and one with motherboard
Thank you very much!!!