GA Z97X UD5H BK rev 1.1 and R9 280X rev 2.0: cannot boots

[evolonman1]

Hi everyone,

I built my PC almost 1 year ago. Here is the specs:

• main Z97X UD5H BK REV 1.1
• cpu I5 4690K
• ram Muskhin 4x4G bus 2400
• vga R9 280X rev 2.0
• ssd Samsung EVO 850 250G
• psu FSP Aurum CM 750w

Two weeks ago, after Windows updated something, my PC could not boot anymore. The error debug code  15, means "the pre-memory North Bridge initialization is started". After few seconds, it automatically turned off, turned on and continued booting again, repeatedly.

I replaced R9 280X by an older card 7870 and it was still the same.
Then I tried with serveral cards and this is the status:

• HD 5670: worked
• HD 7950: worked
• GTX 970: worked
• Intel processor graphic: worked

I also tested with another 600w PSU and the result was the same with my current psu FSP Aurum 750w.

One more information that the bios version is F8. This version I updated at the time I built my PC.

So, why suddently my mb cannot recognize R9 280X and HD 7870?

Many thanks,
Nam Nguyen

[OutOfRange]

I had the same issue with my Z77X-D3H and the new G1 Gaming 1080: The board just went into an infinite boot cycle and never actually passed the BIOS.

Updating the BIOS to the newest version fixed the problem in my case, so maybe this will also help in your case 

[evolonman1]

Thank you, but I searched many times and F8 is the latest official bios version. And everything seemed to  be good until last two weeks. In your case, I can see the bios version was too old, but in my case the bios version was up to dated and the VGA was not the new techonology one.

[OutOfRange]

Sry, my mistake: I was looking for the non-BK board, where there is a F10 BIOS version 

[evolonman1]

Can anyone help me, please ?