GA-X99-UD4P Updated F20 bios now wont post

[bunion]

The system is about 4-5 months old. For last month i had issue with the system freezing/stuttering Completely every few seconds but i have been hoping this was tied to software. It would happen until i rebooted enough times that it would dissapear complety for that session of the PC being on. Usually by the third reboot it was gone.

Today i noticed in the update utility the F20 bios release. I thought it would be a good step to get the latest version especially in light of this issue. The update seemed to run without any error. I did notice it was nearing completion and it went back to the beggining of reading / wrtiting once though. It completed and told me to restart the PC.

The pc will not stay on for longer than about 4 seconds then reboots endlessly. I have removed all ram / gpus and other connections apart from CPU but no difference.

I noticed F21a or whatever the present beta is has a note about fixing a 16gb ram stick issue which is confusing the update utility would allow me to update bios to one with problem compatibility of my system as i use 16gb ram sticks.

I have attempted CMOS reset and Q flash. I will find out tommorow if the usb i was using was indeed formatted in correct file system though. (Had to copy bloody bios file on to it via PVR so i dont know yet) Anyway in the 4 seconds the mobo powers on it doesent read the USB stick as its not flashing once so im doubting its going to work anyway.

I didnt get a system speaker in the box so i dont know if there are beeps or not i will endevour to find out asap. But from what ive said does it look like the motherboard is completly dead and there is nothing i can do? Bit fraustrating as i have a bios backup on the desktop and i thought mobo backed other bios up onto a chip if this happens.

Thanks for reading

[dmdilks]

When you say you did a cmos clear did you pull the battery too?

[bunion]

Yes, thanks for the reply. In the end i sent this back to the retailer. They managed to get it booting fortunately with a smaller 8gb stick which i dont have. The F20 bios has an issue with 16gb ram sticks, which is fixed in F21a. The Gigabyte appcenter suggested i install F20 as the 'latest' update when it had problems. I will never again use windows based software utility to update bios.

Still unexplained: why the board would not boot with no ram so i could Q flash. Also the freezing issue, hopefully this will not occur now i have a newer bios.