Z270-AR POST Issue

[mscaff]

Hi all,

 

Not new to PC issues, so normally be able to resolve these sorts of issues myself, however run out of ideas.

 

New build - the system is having issues POSTing.
New chipset, could just be having release day issues...

 

 - Win 10 PRO 64 
 - Asus Z270-AR
 - Corsair Vengeance White LED 16GB 2x8GB 3200MHz C16 (XMP)
 - Intel i7 7700K 
 - Samsung 850 Evo 250GB
 - Seasonic Prime 850
 - EVGA GTX 1080 FTW

-------------------

 - System intermittently fails to boot from cold boot.
 - System fails to reboot effectively - sometimes taking 10-15 seconds to see Asus splash.
 - Does not display BIOS menu when POST fails.
 - Not a display issue as OS is not laoding (drivers not loading for
   Xonar STX)
 - Issue may be related to XMP OC for RAM.
 - Tested with all-core enhancement ON and OFF.

-------------------------------------
Troubleshooting:

 

 - Reseated RAM - are in A2 - B2.
 - Loaded failsafe defaults.
 - Reset CMOS
 - Attempted to update BIOS, will need to re-attempt, no BIOS info on site just yet.

 

Feel free to share any ideas - will be running memtest86 tonight.

 

Thanks!
Matt