I have a new X299 Dark motherboard that will not boot. Post error code is dF with 3 beeps. No video, no USB ports and a PS/2 keyboard is not recognized.
 
I pulled the board out of the case for troubleshooting. Replaced the CMOS battery which was low when tested (I learned that here looking for some tips). RAM looks good. LEDs all show fine according to what I have read here and in the manual. I removed the CPU and reseated while the board was out and checked for bent pins on the socket and it looks good to my old eyes.
 
I tried the RAM in singles one at a time and tried another single stick just to see if I could get in to the BIOS with no joy. I have tried a spare video card also. All results lead to the dF error code. I also cleared the CMOS and tried the other CMOS options... same results.
 
Open to suggestions at this point. All parts are new ordered just for this build. The only questionable item is the G.Skill RAM was not on the QVL list for a 64GB kit, but I did find a similar part number for a 32GB kit.
 
Specs are:
X299 Dark
Intel 10900X CPU
64 GB G.Skill Trident Z quad kit of p/n # F4-3600C17Q-64GTZSW
EVGA GTX1080ti Hybrid
EVGA Supernova 1600 T2 power supply
Samsung 970 EVO Plus SSD 1TB - M.2 NVMe (MZ-V7S1T0B/AM)
 
The dF post code shows as a reserved for future use, so not sure what to do with that. 
 
Thanks for any suggestions.
 
 

Thanks for the reply. I did contact customer service and a new BIOS chip will be here today. I will update the results in case it might help others.
 
I do have another question. When I flash a new BIOS, do I need to repeat that process for the other two backup BIOS options? And if so, how does that process work exactly? Can I just move the switch to BIOS #2 after the system has booted and then repeat the flash process? My concern is if the backup BIOS is a version older than 1.20 that I will not be able to boot from that to flash.
 
And kudos to EVGA for getting the new BIOS shipped out the same day I called (on the New Years eve holiday)! That shaved a week off delivery time :)
 
Thanks!

I received the new BIOS chip with ver 1.20 on it and that did indeed resolve the dF post code error.
 
All has been reassembled and is running as it should. Now the tweaking begins... OK maybe tomorrow :)
 
Thanks for the support EVGA!

Can confirm....  booting into windows with the 1.20 BIOS chip EVGA sent me, then moving slider, running the bios update batch allowed me to update all three BIOS to 1.20 and all is good.

Hey guys i ordered the board about a week ago with the i9-10900x. You think I probably have the older bios? It was shipped with the switch to rightmost position.

Thanks. Just like OP I can't get it to post. I did purchase it from Newegg so I'm going to call tomorrow and have them ship out a new chip.

TCorzett
Ordered the board from EVGA on Tuesday... received it today... dF post code trying to boot with a 10900X.  Before ordering I called customer support and they said the bios should be updated prior to shipping, but oh well... guess I'll need to get the new bios sent in the mail.  I'm just glad I did a bench test before taking apart my current system to upgrade!
 
UPDATE: Remembering that there's a BIOS selector switch, I figured I'd see if maybe one of the other pre-loaded BIOS would work... sure enough version 1.20 was loaded onto the right most switch (came in the center position).  Very happy to be able to get my upgrades installed!

 
Yep it pays to test All BIOS positions on that MB

Took a week, but I have my new bios chip and am back in business.
 
Thanks!

Hey guys so I just got the updated BIOS chip and it is in the board. Unfortunately now I'm running in to a new problem where I'm still getting no power to the mouse/keyboard and no signal to the monitor, however, the 3 beeps are gone and there is no code dF. No code at all actually its completely blank. The d8 led is red. Any suggestions?

wmmills

issJeffry
Hey guys so I just got the updated BIOS chip and it is in the board. Unfortunately now I'm running in to a new problem where I'm still getting no power to the mouse/keyboard and no signal to the monitor, however, the 3 beeps are gone and there is no code dF. No code at all actually its completely blank. The d8 led is red. Any suggestions?

Did you do a cmos reset after you installed the new chip?

Yes, unfortunately same deal :(

Thanks guys.  Did you guys get it to work?  Im pretty sure I did all 3 bios settings last night and it didnt boot right but now it does.  I cant remember if I just switched to the far right a few mins ago or not.  Thats what it is.  Im not using the i9 10900x like all of you its the i9 9940 (lame how its on newegg now cheaper too after I bought the 9940 IM NOT OVERCLOCKING going with stock speeds I will switch processors with you) and I have the same issues.
 
Im probably going to put this off for another day to see if it will post right not in the mood to hooking everything up.
 
For a min I thought it was the RTX 2080 Ti graphics cards I was like no way this is happening.  The board wont even show a error code with a graphics card in a slot but it will when theres no graphics card.  I hooked a different graphics card one of my older ones in to make sure it wasnt the cards and it did the samething.