Maybe your display?
or try without video card.
Did you flash BIOS before this happen?(or updating any driver?)
Overclocked or default voltage?
Did you try the other Bios. The switch is down by the front panel connection. Change that switch with the power off.
This model is without BIOS switch.
Btw,
try to kick Backup BIOS:
1. Shut off the power supply using the switch on the back of the PSU, wait 10-15 seconds.
2. Press and hold the case Power On switch, then while still holding turn on the power supply from the switch on the rear.
3. Still holding the case power on switch, the board will start, once it does release the case power on switch and
shut off the power supply via the switch on the back of the unit.
(Do the latter two parts as quickly as you can once the board starts)
4. The board will shut down.
5. Turn the power supply back on using the switch on the rear of the unit.
6. Turn on the motherboard by pressing the case power on button.
Once the board starts this time you should see the Gigabyte splash screen, or POST page, then the Auto-Recovery from Dual BIOS will kick in.
You will see a checksum error, and then recovery from BACKUP BIOS will begin. Once it is done reboot your machine and enter the BIOS and load optimized defaults then save/apply/reboot back to BIOS.