ASRock Z270 Extreme 4 - No PCI-E cards detected

DiggsNC01

Prominent
Jul 23, 2017
2
0
510
Hello,

Just built a new system, it is running well when using onboard video. Was going to use my old ASUS Radeon R7 260Xs on this system and ran into a problem. Everything worked perfect prior to moving the video cards over to the new PC.

First, I put in both cards, confirmed seating, power plugged into cards, Plug in DVI cables to cards and unplug the cable going to the onboard video.

Boot up and get no signal to the monitors. Try again with just one card plugged in, same results. Try moving the card to the second PCI E slot, same results no video on monitor.

Move cable to onboard video DVI and get signal, Check BIOS settings, and oddly enough the PCI Express is enabled for video as if it detected the PCI E cards being inserted. ASRock has a system browser function in the BIOS that allows you to see what inputs/slots are utilized on your motherboard. Test both PCI Express slots again and the system browser shows each empty on each test.

Have tested the same video cards in the old PC and both will provide signal to the monitor. Have removed and reseated both cards, tested with 2 and 1 card installed and tested each card in each PCI E slot, all give the same result, no signal from the video card and the system browser in the BIOS shows empty for each PCI E slot.

I have tried all the UEFI settings, Legacy disabled and not one combination has provided a signal from the PCI E cards in either slot.

So I am guessing I have a bad motherboard, but I thought I would check here to see if anyone has any experience with this problem. I have been following Tom's since the 90's and building PCs since 94. This is my first post here, but far from my first time in the forums lurking.

Thanks for any help anyone can provide. Again, I suspect the PCI E slots are bad, and I have contacted ASRock and am waiting on their suggestions.

EDIT: Forgot to put my Specs in

System Specs

ASRock Z270 Extreme 4
Intel Core i5-7600K
(2X) ASUS Radeon R7 260X - R7260X-OC-2GD5
EVGA SuperNOVA 750 G3, 220-G3-0750-X1, 80+ GOLD, 750W
G.SKILL Ripjaws V Series 16GB (2 x 8GB) 288-Pin DDR4 SDRAM DDR4 2800
WD Black 256GB Performance SSD - M.2 2280 PCIe NVMe Solid State Drive
Corsair Hydro Series H115i Extreme Performance Liquid CPU Cooler
Corsair Carbide Series CC-9011048-WW Black / White Steel ATX Mid Tower Cube Computer Case
 

DiggsNC01

Prominent
Jul 23, 2017
2
0
510


I am curious, how would the CPU be the culprit? I can understand PSU or Mobo, but don't see how the CPU could cause the problem.

I started the RMA for the motherboard today, I am pretty certain that is the problem, but was hoping someone could bring up a solution that would prevent me from pulling it and shipping it off.