[Solved] X399 Taichi Won't Boot / No CPU Fan

APDrones, you must use a GPU, your processor/board provide no graphic support.  What shows up in your Dr Debug display?  Do you have both the 4-pin and 8-pin CPU power connectors plugged?  Please make sure the 4-pin is not rotated and they are CPU and not PCIe.  Have you tried the CPU_FAN1 connector?  If still not booting, please insert one stick of memory in A1, the video card and nothing else and see if it will boot or at least post a debug code.  Try all memory slots and all sticks, one at a time.  Enjoy, John.

MisterJ, yes 4 and 8 pins are connected and confirmed 4 pin is in correct orientation and is a cpu harness not a PciE. I have not been able to get any error code on my Dr Debug which concerned me. Will remove all but one memory and try. I was using slots D1 / D2 using the manual going down by priority.

Wardog - will provide mem P/N?™s in a few hours when I get home.

I'll confirm these are a pain to get seated properly. You have to get all three bolts just started and then torque down the plate. I started mine then snugged up in order the three bolts before the final torqueing of them in order. A pain but worth it in the end.

Tanware and Xalter - I agree the initial install took me almost an hour of headache to feel confident in the CPU?™s seating. This second time felt pretty good, I can get the front screw engaged with a little pressure then snug all 3 and tighten in order. The initial install I did not go all the way to the prescribed torque in the provided T20 because I was worried it was too much, I did go to it the second time I checked the CPU and it felt good / I wasn?™t worried.

I also suspected CPU issues from the fan not powering on. This board mounted the same as my old x99 so I reused fasteners and double checked they were tight when I installed the mobo this second time.

What?™s the best way to do basically a bench top check of CPU before installing mobo in case?

APDrones, see your manual for the exact Clear CMOS procedure.  You can also open the UEFI and hit F9 then F10.  Do not place your board on a conductive, much less, grounded surface.  You could mount it on a few of the standoffs and sit it on an insulating surface.  Try powering it up like this before tearing into the CPU again.  Good luck and enjoy, John.