GA-X99-UD4 No POST, No BIOS, No Boot - stuck in loop

[qwerty]

GA-X99-UD4 No POST, No BIOS, No Boot

All fans/lights/hhd's turn on for 5 seconds, PC then turns off (no beeps) for 1-2 seconds & then repeats. Any ideas?

CPU: Intel i7-5820K
Cooler: Coolermaster: 212X
Mobo: GA-X99-UD4
RAM: 16GB 2400 (F4-2400C15Q-16GRK)
GPU: GTX 285
CasE: Corsair 750D
PSU: Corsair RM-850
2x SSD
2X HDD

[autotech]

Does your keyboard and mouse light up? Sounds like bent pins. Do you have any USB devices plugged in at start up?

[qwerty]

Mouse & Keyboard light up (the three num/cap/scroll lights stay solid) until power cuts.

 I tried unplugging everything to isolate, i'll reseat everything & test each RAM module individually this evening.

At the moment I have 1 USB 3.0 External CD/DVD plugged in to the front port (w/ a Win7 DVD inside). Upon turning the PC on you can hear the disk spin & the LED activity light flashes (it has power) but no OSD.

[ex58]

Download latest BIOS F9c and place on USB stick and flash with QFlash Plus.
How to flash:
http://gigabytedaily.blogspot.com/2014/09/gigabyte-x99-new-function-qflash-plus.html

Keep minimum hardware connected to board (even with 1 stick of RAM).
If bootloop again,try to Clear_CMOS.
 

[wobble64]

Probably a stupid question: Did you remember to plug in the 8-Pin power supply for the CPU?

[qwerty]

Yes everything was connected, no the mobo was not shorted.

This will sound silly, i was expecting to do a full rebuild & reseat everything although it worked after I reseated the RAM & rear case fan.

Was able to install Windows and use it for 2 hours, upon rebooting for windows updates i got the same problem. Won't go past POST, no BIOS and won't boot. Holds for 5 seconds and then power cuts for it to repeat.

Pretty sure its either faulty RAM/BIOS needs updating, I'll be looking at it again this evening and update this thread incase others have the same problem.

[wobble64]

I suspect you're right that the BIOS might be the problem. Simply use Q-Flash Plus as ex58 suggested.

[qwerty]

Updated to F9c, only able to use 2x sticks of RAM. When i plug the other DIMMS in i get the same boot cycle.

Borderline infuriating, the memory isn't faulty and is listed here as compatible http://download.gigabyte.asia/FileList/Memory/mb_memory_ga-x99-ud4.pdf.

I pay for 16GB and can only use 8GB.

[wobble64]

Another annoying question, but just to be sure: did you put the ram in the correct slots? In the manual there is a diagram that shows which slots to use when you have 1 or 2 or 4 ram modules.

[qwerty]

Yes, was the first thing i checked.

[qwerty]

Pretty sure 1 of the DIMMS is faulty, must have messed up when cycling through them 1-by-1 to test. It really sucks, i can't RMA the 1x DIMM. It has to be the entire kit.

Sorry to bring bad press to the gigabyte forums, everything else works fine. Just not one of the G.Skill DIMMs.