Does it actually turn on fine? Or totally dead? Couldn't work it out from your post
I replaced a few things recently and now I don't get any beeps on startup when I used to get one :S
Might want to try resetting the bios by taking out the on board battery & changing jumper pins etc. More detailed info should be in your motherboard instruction book.
PS. Do you have a graphics card?
I am curious to why you brought 1x8gb stick of RAM in the first place?, surely it cost more than a 2x4gb kit.
Anyways, I have not encountered that problem before however if this is the case do you have access to some more DDR3 ram ie. from a friends computer just to pass the initial setup?
Although personally I would return the 8gb stick back to your retailer and buy a 2x4gb kit as you can make use of dual channel this way.
I had the same problem a few weeks ago, turns out it was the rams. I'd suggest you take out the rams and try each ram out at a time on the same slot and turn your p.c on.