First I have to go back a little. I use the R5E with a 5820K, Kingston HyperV HX430C15PB2K4/16, a MSI GTX 980, a Plextor M6e since late summer 2014. Late 2015 I changed the M.2 SSD to Samsungs SM951 and the GPU to the MSI GTX 980Ti Gaming. First with Windows 8.1 Ent. then with Windows 10 Ent. Everything worked fine. Oh I run the HyperX Memory in XMP profile 2 with 2666MHz, profile 1 (3000MHz) seems not stable with the 5820.
A few weeks ago I had an issue with the boot process stuck after POST with just the ROG logo but not booting Windows 10. The R5E shows the Q-Code F6 / Fb, after a few tries and sometimes Windows 10 Startup repair it worked again for about 2-3 days. But I did get really annoyed and planned to take the whole box apart and install a new power supply at the same occasion (AX1500i & CableMod) - a big mistake, in retrospect.
The built worked quite well. A quick check "on the open patient" does not showed abnormalities. So I assembled all. But after 2-3 restarts I stuck in the same problems again; switch on OK, BIOS OK, POST not OK. Again ROG logo but no Windows boot, again Q-Code F6 / Fb. I scheduled the Windows reinstall for today Sunday. Sunday morning I briefly reassigned the H105 pump instead of CHA_FAN1A to CHA_FAN1B - and again from CHA_FAN1B to a 12V-Molex adatper to the power supply (I hate when the bios or Al Suite mess up the Pump rpm which should run at full speed alltime) - that's it - somehow this was the beginning of the end. After restart the screen stays black - no signal whatsoever. Tried it with different ports on different displays. The screen stays black. Q-Code AA - so everything should be perfect. Then somehow I connected only the HDMI to my beamer and volia I did get the BIOS. Then I was able to boot into Windows 10, connect the DP to my Display and switched over with Win+P to the DP. Reboot and everything went away again - but this time permanent. I try to recreate the last working case but no luck.
I then started to plug the GPU into another PCI slot and somehow managed to break the slot unlock - duh. When something goes wrong everything goes wrong - it's sunday and outside it rains.
Only later I noticed that the VGA_LED is permanently illuminated. So GPU back out CMOS reset, Switch between BIOS 1 (v2101) and 2 (V2001) merrily back and forth, always lit VGA_LED even without GPU, then sometimes VGA_LED lights along with BOOT_Device_LED and then again only alone. tried everything possible, RAM in a different order, even built in the old Plextor M6E, the same. Extremely frustrating. Q Code changes randomly between 40, d6 and again the perfect AA.
Tomorrow I take the GTX 980 Ti to the office and test it in another PC (Dell Precision), after that I take a Quadro home test it in R5E. Then I will probably hopefully know whether one or both two components are gone. I strongly suspect the MB, I already had some history with their QM with my Asus Swift PG278Q.
Cheers and I hope you all had a better sunday,
Nick