Alan, if the ram swap does not work, try using another GPU (which I know you have several). If that does not work, remove everything except what is absolutely needed for the system to post. No HDD, 1 stick of ram, a known good GPU, no DVD, and only the mouse and keyboard connected. If that does not work, remove all the ram and start it. I know it won't start, but you should hear a series of beeps (which is a good thing), which will let you know the motherboard is doing what it should. Also, when you installed the CPU, did you check and make sure there were no bent pins?
If removing everything gets it to post, install 1 item at a time until you find the problem. Does that board have anything like the Asus memory OK feature. The symptoms you describe is what Asus boards do when it is searching for the correct timings and voltages for the ram to boot. It will keep trying until, hopefully, it finds a frequency and timings that will allow it to post.