CMOS reset. Then try single memory module in each of the 4 channels, one after another. Then repeat with the other memory module. Note any beeps and come back to us.
you sure the 8pin is connected, as I didn't put mine in properly, and it did the same, pushed in correctly, voila.
Check it is in all the way
I left it for like 30seconds. The manual says it needs only 10s and you should power up in the reset position (which won't work ) to reset everything.
Plus its not much of a fix if I have to do that EVERY time I wish to boot...