GA-Z97X-UD7 TH - Board/Gfx does not seem to resume or cold boot anymore

Hi guys,

Been a long time since i posted here, but i was running into some issues with my system and was hoping you could help me out!
I've been using this build for 2 years now and for about 6-8 months i've been running into the problem where the system no longer seems to boot and seems to get stuck in a boot-loop.
I've contacted Gigabyte on this matter and they were pretty much clueless. They gave me a later BIOS version for the board (F7A) , but that never seemed to make a difference.

The problem is, that the machine does not seem to like it when i cold boot it, say every day (turn it off in the evening, then turn it on in the morning). It will show me the BIOS splash screen and after that it will cycle off/on the machine and get stuck in a boot-loop.
What seems to work is when i take the power from the board completely and also take out the graphics card and wait for 30 seconds. Put everything back in, then the motherboard will boot up fine again.
When it runs; I have no stability issues with the machine at all and it performs great. It's just that i'm scared to keep reproducing this finding out of fear it will stop booting altogether (so i just leave the machine running now :p: ).
When i try to use sleep mode i get similar complaints. PC powers on at resume, but there will be no picture and the screens will stay blank.

I guess all of this seems to point into the direction of the motherboard and its out of warranty too (just my luck).
I've tried my luck on the Gigabyte forum where someone might have mentioned turning off fast boot since it might corrupt the BIOS or something. I tried this, no change in results unfortunately.
Also, i've never OC'ed this system.

Anyone here that might know if this is a UEFI Boot or PCI-e power setting in the BIOS? Or is my board, somehow fried? :(

Specs:
Intel Core i7 4770K
Gigabyte GA-Z97X-UD7 TH
Crucial Ballistix Tactical Tracer BLT8G31608DT2TXOBC (1600 MHz)
Seasonic X-850 80+ Gold
Intel 750 SSD PCIe 3.0 x4 400GB
Gigabyte GV-N98TWF3-6GD (GTX980TI Windforce
2 x Seagate ST4000VN000, 4TB

[Edit]
Here's a link to the thread on the Gigabyte forum: https://forum.giga-byte.co.uk/index.php?topic=18102.0

Seems MB problem. just few recommendations. did it reboot fine within win? try different GPU, single ram and reset CMOS.

Quote:

Originally Posted by xpower

Seems MB problem. just few recommendations. did it reboot fine within win? try different GPU, single ram and reset CMOS.

When the system is up and running, i can reboot without problems from Windows yeah. :)

It's hard for me to test with a different GPU. The PC works fine on the i7 igp, but i don't have any other card at my disposal which has similar load to the GTX980TI (to be sure its not a load issue).