No post after CMOS reset

[Wookieschnitzel]

Brand new GA-B250M-DS3H motherboard, Intel G4620 chip and gskill NT 2x4gb 2133. Retail Windows 10 USB.

Could not get OS to install. Computer reboots upon reaching first screen of install. Tried legacy everything and windows 7 dvd. Same result.

Reset CMOS and now computer won't post. Lights on board work, cpu fan spins. No beep. Reboots. Continues on until I hold down the power button for a few seconds.

I have tried removing the battery overnight. I have tried holding the reset button for 10 seconds while holding power   button. I have tried turning off with PSU switch holding power button then turn on with PSU switch wait 1 minute try again. All fail
Static wrist band always worn. Power cord always removed before CMOS reset.

I am at a loss. Any help would be greatly appreciated. Thanks.

[shadowsports]

See if this helps:

Recover from GIGABYTE Backup BIOS  (Only for motherboards with Dual BIOS technology)

Method #1:
1.Shut off the powersupply by pressing the button on the ”PSU” or by removing the power cable.
2.Press the powerbutton 3-4 times to empty the stored energy in the power supply.
3.Turn on the powersupply
4.Press and hold the powerbutton, the system will start the bootup procedure but will shut down after a few second. Release the powerbutton after the system have shut down completely.
5.Press the powerbutton to start the system.
6.If this technique was successful the system will boot and you will see the following image.

Method #2:
1.Shut your PC down.
2.Hold the power AND the reset button for about 10 sec, than release.
3.Backup BIOS should kick in anytime soon now.

Method #3:
1.Short out pins 1 and 6 on the main BIOS chip (pin #1 should be marked with a red dot or whatever)
2.Tell a friend (or a relative) of yours to press the power on button
3.Remove the ghetto-like jumper you’re holding between pins 1 and 6 as soon as you hear a beep.
4.Backup BIOS should kick in again and everything will (hopefully) be fine.