New PC Build - POST issue

xicemanx13x

Apologies in advance for the essay.

Just finished building my first PC. Watched tons of videos, checked 3 different part compatibility checkers, been planning and slowly acquiring parts for months. Complete the build, go to power on, no display. All my RGBs work on case fans, cooler fan, RAM, GPU.  Power button on my case blinks white rapidly for a bit, then on/off about every second for a bit, then 3 seconds on/3 seconds off until I power it down. No display at any point. My motherboard has no status LED, and no speaker.

I tried running HDMI from my GPU to TV, then disconnecting my GPU and running HDMI from my motherboard to TV, still no display. Even pulled the rig upstairs to a different TV. Still no display, still same power button blinking pattern.

I took my cooler off the CPU, checked the chip, it all looks okay. No debris in pins, no excess thermal paste.  CPU arrow oriented correctly. RAM is securely clicked into the correct DIMM slots per motherboard manual. GPU is/was connected and powered by 2 PCIe connections from my PSU. All the necessary PSU and case connections have been made. 24 pin motherboard power, 8 pin CPU power, the USB connections from the case, etc. all connected.

Any ideas on what might be going on? Any troubleshooting support would be greatly appreciated.  Specs below:

CPU: Intel i7 12700KF

Motherboard: ASUS Z690-P Prime WiFi w/ DDR5 

RAM: Corsair Vengeance DDR5 2x16

GPU: Gigabyte NVIDIA GeForce RTX 3080

SSD: WD BLACK 1TB M.2 NVMe Gen4

Case: Lian Li LanCool III w/ RGB 

PSU: Corsair CX750 

CPU Cooler: ThermalTake CX200 SE

Display: Samsung 65" 4k UHD TV

PowerSpec_MikeW

@xicemanx13x

I suspect it's saying video output is the issue. You've got a 12700KF, so there's no IGP to work with. You might try the 3080 in another slot, make sure PCIe power is connected. Try another monitor/TV/HDMI cable if you have it. If you've got another GPU, that's worth testing. You can also try the GPU without PCIe power connected, see if it'll throw a error about that.

xicemanx13x

No dice. Tried different PCIe, different TV, different HDMI. Same power light blinking pattern. No display. Unfortunately I don't have a 2nd GPU to try.

xicemanx13x

I'm getting a motherboard speaker tomorrow. We'll see what happens then

xicemanx13x

Other thoughts I had, maybe one of these makes sense...?

1. GPU is used, everything else was new. Though, I bought the GPU from a trusted/verified source. Is it possible that drivers were downloaded for the GPU by the previous owner, and this is causing issues?

2. GPU has 2 HDMI ports / 2 Display Ports. Neither HDMI port works. Is it possible only the DisplayPorts work?

PowerSpec_MikeW

@xicemanx13x

It's possible. Previous owner could of tried a firmware update and partially bricked the card, we don't know the history. You can try a DisplayPort to HDMI adapter.

With the blinking pattern. 2 seconds is VGA, 4 seconds is boot. I think you said 3 seconds in the original post. Which one is closer?

xicemanx13x

Definitely closer to 4 seconds. That's almost a relief.

PowerSpec_MikeW

@xicemanx13x

If that's correct, then it's a boot issue. There's something on the screen you can't see, leaves us at a display output issue. I'd try DisplayPort to HDMI.

xicemanx13x

Thanks for the help. I got my motherboard speaker today, beepcode is "No VGA Detected. I'll try to get a DisplayPort to HDMI adapter and see how that works

xicemanx13x

DisplayPort to HDMI converter did not work. No display, same error. Reached out to NVIDIA Customer Support to see if it's possible to flash the GPU with "as purchased" drivers. Any other suggestions?

PowerSpec_MikeW

@xicemanx13x

Not at this point. Everything says GPU. We've got to verify that's the issue and then see what Nvidia can do to help you out if there's a remaining warranty.

xicemanx13x

NVidia support directed me to Gigabyte support. I plugged the GPU SN into the Gigabyte support site, it's still under warranty. I'll plan to work with Gigabyte support at this point. Any experience or insight as to if they'll honor a warranty on a pre-owned GPU? 

PowerSpec_MikeW

@xicemanx13x

None whatsoever. I haven't had any Gigabyte products personally since X58.