Gigabyte has answered me with a standard answer
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Dear Alexander,
Thank you for your kindly mail and inquiry. About the issue you mentioned, because several possibilities might cause the problems, such as something wrong with memory, motherboard, BIOS, power, attached hardwares...etc. We suggest that you could try to do a simple test first:
Remove such as add-on cards, devices from motherboard and make sure others on the motherboard are installed properly, then please take off the on-board battery to leak voltage to clear CMOS data by following the steps below:
1) Turn off power.
2) Remove the power cord from the PSU.
3) Take out the battery gently and put it aside for about 5 minutes or longer. (Or you can use a metal object to connect the two pins in the battery holder to make them short-circuited.)
4) Re-insert the battery to the battery holder.
5) Connect power cord to PSU again and turn on power.
6) Power on your system.
7) If BIOS can POST, please enter the BIOS and load the fail-safe defaults setting.
7) Save changes and reboot the system.
After clearing CMOS and load the fail-safe defaults, please run your system and test LAN function in a simple environment by only putting CPU, single memory, single HDD, VGA card and power to observe the result. If there's nothing wrong in simple environment, try to install several additional cards into the slot one by one to observe the result again and again.
But, if the problem still occurs in a simple environment, then there may be a hardware problem with the LAN controller, a further testing or examination to your system might be required. We suggest you can contact your supplier or nearest distributor and see if they can help you to test your system directly. For distributor contact information, please click
HERE.
We are really sorry for the inconvenience you have with our product.
At last, if you still have any further question or suggestion about our products/service, please do not hesitate to contact with us. We will try our best to help you resolve the problem ASAP.
Regards,
GIGABYTE TECHNOLOGY
So what i can do is only to return this board to suplyer.