POST Problems on new build

[Led]

I just finished my fist-ever build but it won't boot. When looking at the POST status lights, the CPU and DRAM lights clear properly, but I'm getting stuck at the VGA light. I double checked the 8-pin connectors and I'm pretty sure everything is seated properly as the fans on the GPU are spinning, but I could be wrong as I'm by no means an expert. Any help would be greatly appreciated. Here's my build:
Ryzen 7 3800x
ASRock X570 Phantom Gaming 4
EVGA GeForce RTX 2080 TI black
Corsair Vengence LPX 16 GB DDR4-3600
Crucial P1 1 TB M.2 -2280 NVME SSD
Corsair Vengence 650 W 80+ Silver Semi Modular ATX PSU

[Windows7ge]

Can you try putting the GPU in the other X16 slot? Do you have another GPU to test with?

[Led]

Just now, Windows7ge said:

Can you try putting the GPU in the other X16 slot? Do you have another GPU to test with?

I can only use the bottom x16 slot because the CPU cooler blocks the top slot. And no, I'm a noob and only have one GPU.

[Windows7ge]

10 minutes ago, Led said:

I can only use the bottom x16 slot because the CPU cooler blocks the top slot. And no, I'm a noob and only have one GPU.

When I was first starting out I had a spare GPU around  Mind you it wasn't pretty. Just a 1 slot MSI NVIDIA GeForce 7600GS. Good spare for the time. (I was using onboard video but later switched to a XFX Radeon HD 67-I actually can't remember the number. 6700? 6770? Too long ago.)

 

What CPU cooler are you using? It's generally recommended to use the top-most slot for the best results (lower slots may go though the Chipset). If the VRM heatsink allows the clearance you may want to rotate it so you can accommodate the GPU in the top slot.

[Led]

39 minutes ago, Windows7ge said:

When I was first starting out I had a spare GPU around  Mind you it wasn't pretty. Just a 1 slot MSI NVIDIA GeForce 7600GS. Good spare for the time. (I was using onboard video but later switched to a XFX Radeon HD 67-I actually can't remember the number. 6700? 6770? Too long ago.)

 

What CPU cooler are you using? It's generally recommended to use the top-most slot for the best results (lower slots may go though the Chipset). If the VRM heatsink allows the clearance you may want to rotate it so you can accommodate the GPU in the top slot.

I'm using the Noctua NH-U14s. Before I bought it I asked for advice on a different forum as to whether or not using the bottom X16 slot would cause problems and folks said I should be fine. Now that I think of it, I could test with the stock-provided CPU cooler so I could test the upper x16 slot. The thing that confuses me though, is that the GPU lights up and the fans spin which makes it seems like it should be working.

[Windows7ge]

34 minutes ago, Led said:

I'm using the Noctua NH-U14s. Before I bought it I asked for advice on a different forum as to whether or not using the bottom X16 slot would cause problems and folks said I should be fine. Now that I think of it, I could test with the stock-provided CPU cooler so I could test the upper x16 slot. The thing that confuses me though, is that the GPU lights up and the fans spin which makes it seems like it should be working.

Ordinarily it shouldn't be a problem to use the lower slot. The only issue is sometimes the slot is only wired x8 electrically and it may go though the Chipset instead of directly to the CPU. This won't cause failure to POST issues but with GPU's getting faster and faster it may cause a performance bottleneck where you're not getting what you paid for.

 

Just because the fans spin and LEDs light up does not mean the system will POST and run correctly. It's a good start to see that those functions are working but something else is definitely wrong.

[Led]

9 minutes ago, Windows7ge said:

Ordinarily it shouldn't be a problem to use the lower slot. The only issue is sometimes the slot is only wired x8 electrically and it may go though the Chipset instead of directly to the CPU. This won't cause failure to POST issues but with GPU's getting faster and faster it may cause a performance bottleneck where you're not getting what you paid for.

 

Just because the fans spin and LEDs light up does not mean the system will POST and run correctly. It's a good start to see that those functions are working but something else is definitely wrong.

This is what the mobo manual says regarding the PCIe slots:

AMD Ryzen series CPUs (Matisse)
- 2 x PCI Express 4.0 x16 Slots (PCIE1/PCIE3: single at x16 (PCIE1); dual at x16 (PCIE1) / x4 (PCIE3))*

[Windows7ge]

3 minutes ago, Led said:

This is what the mobo manual says regarding the PCIe slots:

AMD Ryzen series CPUs (Matisse)
- 2 x PCI Express 4.0 x16 Slots (PCIE1/PCIE3: single at x16 (PCIE1); dual at x16 (PCIE1) / x4 (PCIE3))*

Oh wow, if you ever put anything in the top slot your GPU will get cut down to x4. That might be fine it might not. I'd have to test it but I don't have that platform to do it on.