Help! Wife's Graphics Card Not Detected

[turbotong]

UPDATE: RESOLVED. MODULAR PCIE POWER CABLE WAS NOT PLUGGED IN ALL THE WAY.

Hi everyone,

I just did a build for my wife so she can game with me. We turned it on and it boots, but the 1060 graphics card isn't detected. It's not showing up in device manager AT ALL, not even as an unknown device. Windows 10 loads and integrated graphics works. BIOS is set to PCIE graphics first. Latest windows updates. I can't install Nvidia drivers because no Nvidia card is detected (the driver installer requires a card to be detected). I tried a different graphics card (980 ti), but that still didnt work. The 1060 does work in another computer, so it is not the 1060's fault. Mobo replaced out, no effect. Re-seated graphics card, no effect. Moved to different PCIe lane, no effect.

Build:
Processor: intel Core i5 8400
Graphics: EVGA Geforce GTX 1060 6GB SSC
MoBo: GIGABYTE Z370 AORUS GAMING WIFI (rev. 1.0) LGA 1151
RAM: Team Vulcan 16GB (2x8GB) DDR4-2400
Storage: ADATA XPG SX8200 960 M.2-2280 SSD (nvme)
OS: Windows 10 64 bit
Power Supply: Corsair RMx (2018) 550W 80+ Gold

Any suggestions?

I'm left to suspect:
1) Power supply (550W should be plenty per PC part picker). Right after this post, I'm going to plug in the computer to a different power wall socket and re-connect the modular cables. If I don't post anything, assume that this didn't work.
2) Processor (unlikely that the ONLY defect is no graphics card detected?)
3) RAM (unlikely that the ONLY defect is no graphics card detected?)

 

[King_V]

Two things you might try, but I know I'm on shaky ground here:

1 - Is there a BIOS setting for forcing the system to use the PCIe card rather than integrated graphics?

2 - Have you tried booting up with the monitor plugged into the 1060 rather than into the integrated graphics port?