I spin a familiar yarn - I just built a new computer. I have an ECS 755-A2 mobo w/an AMD Sempron 3000 64-bit chip and 400 W power supply, 1 gb memory and a Jaton GF MX4000 128 AGP 8x video card (NO onboard video). When I power up, I get an Award BIOS video post error code (no picture on the monitor - at all). 1 long beep and 2 short ones. I have stripped everything back out and left only the board, chip, memory, and video card. I get the POST problem with or without the video card in it. I can unplug the ATX 12V connector and make ALL of the POST errors quit, but I know it has to beep at least once to tell if it's okay and doing that still doesn't resolve my problem. My question is, what could be the culprit? I don't have ready access to another AMD computer so I can't test all the components. My first thought is bad video card, but why would it do it regardless of whether or not the video card is installed? Thanks in advance.