Hello please let me know some information on your system:
- Which BIOS version did you install?
- Have you tried to access the BIOS in maintenance mode, moving the jumper to position 2 and 3?
- Are you using a video card? If you are not, you can try to install one (if you have any) that will allow you to access BIOS and then, you can try to roll back to the previous version installed.
- You can leave the system without the battery for more time, like 2 hours, please remove the power supply from the board also.
Finally if the motherboard is still under warranty please get in touch with our Warranty Department so they can help you to replace the unit: http://www.intel.com/p/en_US/support/contactsupport