I bought a ECS K7S5A with AMD 1G Duron (boxed) combo, and 350W case from Frys last week. When I switch on the machine after assembly, CPU fan started running, HD led flashed once, then nothing else happened. No display, no beep sound. I tried to disconnect all devices, cards, replace memory, it still did not work. I installed PC133 SDRM. Does anybody know why? Thanks