I just built a computer the other day and I plugged in the monitor to find a little screen that said "No Signal". I don't have an OS installed on it yet and was expecting to see a BIOS screen. I'm using an Acer monitor, an Athlon II 2.8Ghz processor, ECS A780GM-A Ultra MOBO, 2GB ram, 450 Watt PSU, and an old ATA cable HDD . I have plugged the monitor into other computers, and it works great. I've tried hooking the computer to other monitors, and hooked an SATA HDD with no success. I don't have any optical drives hooked up yet. Can someone tell me how to fix this.