All the test that you did are relevant, everything that you did were right.
What is the AA number of the board?
As you can see from the Specification Update:
Board with these Aa number are born with a bios version 0075
Now from the supported Processor List,
Your cpu requires a bios version 0077 to be able to work properly.
So i guess that it is worth of giving it a try.
The best advice is to get your reseller update the board bios for you to the latest version 0113.
Otherwise, you can try another CPU which require a lower bios revision and then update the bios to latest revision.
Keep us posted.
All the best,
I have a similar problem. My board has AA number: E27730-308
What bios version is that born with?
Try to remove RAM; then it will beep if the cpu is working.
I saw something about how to do a emergencye BIOS recovery in a other thread - it might work for this board too with a newer BIOS.
I had change to an older CPU, upgraded bios, put back the original CPU and then the system started.