Have you tried testing the RAM? I had a stick go bad and all the lights and fans would turn on but it would not post. Might be worth checking if you have more than two sticks you can see if one went bad.
Both sticks work and are at default settings, so RAM is not the issue. Thanks for the suggestion though.
I would have tried removing everything and reseating it with an issue like that. You would be amazed how many times that fixes it.
I tried that but the computer will not boot up; the card stays at 100% fan speed as it occurs when it first starts up.