ECS K7S5A Pro board with AMD processor of athlon 2000xp or above will most likely require a MINIMUM power supply of 300WATTS!!!
And thats with the minimal amount of equipment!
~cdrom, hdd, floppy, 1 stick of ram, cpu, and 1 case fan~
anything more and its gonna require a 400Watt+ PSU.
Its stated in the manual itself...read!
Truckie