ecs pf21 motherboard question

I am building a new pc for myself using the ecs pf21 MB. I have it all together and every time I power it up everything comes on just fine, but 5 seconds later it powers off, and a second later powers back up and continues to cycle like this till I manually power it off.

I switched the processor out for a new one, same thing. Tried different Ram (new in both cases) and still same thing. I have read everything I can find with no answers in site. I really dont want to buy even more new parts to try and get this running, anyone have any ideas on what it could be?