Hello all, new to the site and unfortunately I am here because of a problem. I have just built my third PC of the last 4 years and this one is my first problem. These are the primary components. Power Supply, SeaSonic S12 SS-650HT Motherboard, Gigabyte GA-EP45C-UD3R Intel Core 2 Duo E8500 Wolfdale 3.16GHz Memory, OZC Reaper OCZ2RPR11502GK Video Card, Gigabyte GV-R485OC-1GH Drive, Western Digital WD5000AAKS 500GB Got everything assembled and went for the first time power-up without the operating system installed. I cannot get into BIOS or see any POST activity on the monitor. Display just says, "Check signal cable". Fans run, power LED is on, IDE and SATA power-up activity seems to occur. A beep occurs about seven seconds after power-up and motherboard PHASE LEDS are on for about 15 seconds and then they turn off but the system remains powered. The monitor works when connected to my other PC. Does anyone have any troubleshooting suggestions? Where do I start?