Just finished new build but my tried and true GPU is not working. Mobo issue?

[Fureak]

Hi everyone, the build I just completed below is below, I built it in prep for the RTX 3080. After building and booting it up running on integrated graphics every thing is working fine and works with my LG 38 ultra wide I picked up from Costco. Unfortunately it’s probably going to be a while until I get my hands on a 3080 so I put in my ancient gtx 970 and now my screen is just blank. It’s still booting correctly, as the only q-leds lighting up at the top of the strip are the green and white one, which don’t have any label next to them, and they were lighting up back before I added the gpu and everything was working fine.  I know that there is power getting to the GPU as it is lighting up and the fans are running. Curious as to what I can do to fix this issue and get my gtx970 to work properly.

 

Monitor: https://www.costco.com/lg-ultragear-38%22-class-ultrawide-wqhd-curved-ips-g-sync-compatible-gaming-monitor.product.100671950.html

 

PCPartPicker Part List

CPU: Intel Core i7-10700K 3.8 GHz 8-Core Processor  ($393.89 @ Adorama) 
CPU Cooler: Corsair iCUE H100i RGB PRO XT 75 CFM Liquid CPU Cooler  ($119.99 @ Newegg) 
Motherboard: Asus TUF GAMING Z490-PLUS (WI-FI) ATX LGA1200 Motherboard  ($198.34 @ Amazon) 
Memory: G.Skill Ripjaws V Series 32 GB (2 x 16 GB) DDR4-3200 CL16 Memory  ($105.99 @ Newegg) 
Storage: PNY XLR8 CS3030 1 TB M.2-2280 NVME Solid State Drive  ($122.99 @ Dell) 
Case: Fractal Design Meshify S2 ATX Mid Tower Case  ($161.99 @ B&H) 
Power Supply: Gigabyte 750 W 80+ Gold Certified Fully Modular ATX Power Supply  ($119.99 @ Newegg) 
Total: $1223.18
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2020-09-18 21:55 EDT-0400

[Deli]

Go to BIOS and change the graphics output to PCIe from iGPU.

[Fureak]

2 minutes ago, Deli said:

Go to BIOS and change the graphics output to PCIe from iGPU.

I was looking for that in the BIOS but can not seem to find it.  Do you know where in the ASUS TUF z490 BIOS I can make that change?  There is nothing in the manual. 

[Deli]

2 minutes ago, Fureak said:

I was looking for that in the BIOS but can not seem to find it.  Do you know where in the ASUS TUF z490 BIOS I can make that change?  There is nothing in the manual. 

There must be somewhere. Even cheap mobo will have this BIOS function. The worst case scenario, clear CMOS. Usually the mobo will detect there is a graphics card and uses it for output. Plug the HDMI/DP cable to the GTX970 after reboot of course.

[Fureak]

56 minutes ago, Deli said:

There must be somewhere. Even cheap mobo will have this BIOS function. The worst case scenario, clear CMOS. Usually the mobo will detect there is a graphics card and uses it for output. Plug the HDMI/DP cable to the GTX970 after reboot of course.

Found it!  Was able to get it to boot up with the gpu installed while running off the iGPU, installed the nvidia drivers then just plugged the cable into the 970 and it works!