I have the same situation. I am thinking about sending mine to a repair shop, to get the bios chip replaced, since I believe thats where the problem is.
I have spotted a person, who have solved the problem.
The solution explained shortly. Take out the CMOS-battery and try to turn the computer on. After >100 tries the person on sweclockers succeded. When Windows loaded, he reflashed the BIOS.
This solution can´t work for me, since my windows can´t load. So I can´t flash BIOS since it can only be done from windows, unless you have speciel tools. So I have sent my motherboard to a shop in Germany, to get the bioschip reflashed/changed.
I can now confirm, that replacing/reflashing the BIOS-chip works. I have my computer up and running.