|I have the exact same problem. But mine occurred right after a power cut. The only thing I have not tried is take the mobo out, but I've tried everything, including removing the RAM. The RAM made the error noise, so it was not the RAM. I tried single, and double but both configurations still had the same thing.|
What happens is that the lights on the power and the lights on the keyboard and CD-Rom blink alternatively. I can't boot from CD nor can I boot from USB. I'm essentially stuck at square one.
I've even unplugged the CD-Rom drive and the HDD alternatively to see if disconnecting one would force a boot for the other to no avail.
I have read that it could be a problem with the PSU, but I don't have a replacement for it.
I will try to remove the Mobo and see if that is the problem, but I can't see what it would be.