Just so you know ECS K7S5A Pro board is very picky with alot of thing
(1) its picky with the PSU you use and knowing that its a 250 watts its too low. Get another PSU get around 400 watts just incase you decide to add things on later. PSU are very cheap these days I have Powmax 450 watt PSU which works perfectly fine with ECS K7S5A Pro
(2) The second thing you might encounter is Ram compatibility Yes yes this board is also picky with which ram you use. Find out what type of ram you have and check there website and see if its compatiable.
Once you get it going this board is awsome! No problems for me just yet. got it going on the first shot. Had trouble with my soundcard but that was with the drivers of that soundcard. SO good luck and let us know how it worked out