Motherboard wont Post after BIOS update F16 on GA-X73-UD3 (rev 1.0)

[dapostol73]

Hi All,

Recently I updated my home built PC to Windows 8.1, there was an issue with my HD audio not working so I thought a BIOS update would help, which it did but Windows 8.1 had SecureBoot watermark, which I tried to fix by configuring manually configuring my SecureBoot BIOS features.  This cause my computer not to POST, I there reset my machine by removing the BIOS battery and jumping the Clear CMOS pins, this got me back up and running with a BIOS restore.  I then configure my SecureBoot properly and had no more watermark, the system seemed to work fine restarting multiple times with no issue until I shutdown.  On the next cold boot my machine would not POST again.  I repeated the steps above multiple times, but I cannot get the PC to POST at all now, the odd time if I do a reset while it's booting, it will POST and try and go into the BIOS setting and then shutdown.  I have no idea what is wrong, is my motherboard toast, is there anything I can do to fix it? help please.

PC Specs
Motherboard : Gigabyte GA-X79-UD3 (rev 1.0)
Processor: Intel Core i7 3820 Quad Core
RAM: Corsair 2x4GB
Video Cards: 2xSLI Gigabyte GTX 470 GV-N470D-13I
SSD: Kingston 240GB Sata3 (SV300S3B7A/240G)
HD: 2xWestern Digital Caviar Black 1TB SATA3 (WD1002FAEX) in RAID1
DVD: ASUS BW-12B1ST Blu-Ray Writer (BW-12B1ST/BLK/G/A)
PS: XFX ProSeries Black Edition 1000W

Thanks,

[dmdilks]

Your video card could be the problem. It isn't a UEFI video card and some people have fix it.

That is with updating the bios on their card to support UEFI. You need a GTX-660 or high to do this.

You might have to force the backup bios to kick in. http://forum.giga-byte.co.uk/index.php/topic,13351.0.html

[dapostol73]

I'll give it a try, but where can I find an older BIOS update, I try to find them on the net with no luck.

Does Gigabyte have an site for downloading old BIOS flashes?

[dmdilks]

You can look at these ones.

http://forums.tweaktown.com/gigabyte/28441-gigabyte-latest-beta-bios-4.html#post270610

[dapostol73]

Thanks, I'll try this....you mentioned I should use update F14, is there anyway to know what was fixed with each BIOS releases on this page?

[dapostol73]

  Thank you so much, I'm up and running without SecureBoot enabled, I guess I leave it off for now, with the dumb watermark.

I tried to update my Video Card Bios using VGA Tools - @BIOS but the tool says it can not detect my video card, is there something I am missing?

[dmdilks]

You have a older video card and even if you could update it. It still might not support UEFI. You might have to do some research on that.