PC boots and functions perfectly well, no video output

[Cellon]

I was playing World of Warcraft when my PC suddenly shut down on it's own. Judging by the lights in my house, this was not caused by the power delivery. After a few seconds it started booting up by itself, however my monitors never got any signal. I have confirmed that it boots perfectly well, I was able to use CMD to make some noise and shut down the computer. In addition the GPU is not dead, it's a Sapphire Radeon RX480 Nitro+ 8GB and it has a button on it that... switches between profiles I think?... anyways when I press it the RGB on the card changes.

Before I start trying to RMA the GPU, I was wondering if anyone has any suggestions. I've already tried reseating the card. In addition, possibly unrelated, yesterday I updated my GPU drivers to the latest optional driver after using an old version since January or so. I would try to insert it in another PC to confirm, but I would need to ask a friend to use his computer so it's going to be a last-ditch effort kind of thing.

I was also wondering if the whole shutdown-reboot thing that happened could be the fault of the PSU or if it could happen with just a faulty GPU.

Edit: small update, after discovering that my new mobo had onboard graphics unlike my previous one, I am capable of accessing my PC. I used DDU to uninstall the AMD driver, still no video signal. The device manager does not recognize any other graphics card than the Microsoft Basic Display Adapter which I assume is the onboard graphics solution. Dead card?

I have also tried seating the GPU in the lower PCIe lane, no dice. Exact same situation.

 

[JuniperSprouts]

That sounds like a dead GPU. Can you test another GPU? Have you tried the various outputs (DP, HDMI, DVI, etc)?

To answer one of your last questions: Normally, Windows (Device Manager) will not detect that GPU unless you have it connected to a monitor.

 

[jerrylee22]

Make sure you try every port, and if you can, use all display types (HDMI, display port, and DVI). If that still won't work, it would help to try another graphics card. If you can't do anything and it refused to work after waiting and rebooting, you unfortunately may have to RMA the card, as the GPU or the PCB could have been damaged during shipping/handling.

OTHERWISE, do you have Windows 10? I have an NVIDIA GTX 1080 Ti, but when I first booted into Windows 10, it did not boot off of my GPU (and instead integrated graphics) despite the HDMI (-~-) being connected to it and not my motherboard, and was not visible in device manager. I installed the drivers and rebooted three times. It still wouldn't render. After maybe 20 minutes, it finally rendered my graphics card GPU in device manager, and my resolution changed - it began to use my graphics card, and it has been working great ever since then.

 

[Cellon]

That sounds like a dead GPU. Can you test another GPU? Have you tried the various outputs (DP, HDMI, DVI, etc)?

To answer one of your last questions: Normally, Windows (Device Manager) will not detect that GPU unless you have it connected to a monitor.

Gotcha. I have a friend who offered to let me use his GPU while he is at sea, so I'll see if that functions correctly. I have two monitors, one connected through DVI and one through DisplayPort, neither work. I don't have a HDMI cable handy where I am right now so it'll have to wait but I expect the same results.

To follow up on the device manager stuff, so it might not appear in device manager if it does not detect a monitor connected to it but should the driver installation software still be able to detect it? Because the AMD driver installation software refuses to do anything because it does not detect any AMD hardware.

Make sure you try every port, and if you can, use all display types (HDMI, display port, and DVI). If that still won't work, it would help to try another graphics card. If you can't do anything and it refused to work after waiting and rebooting, you unfortunately may have to RMA the card, as the GPU or the PCB could have been damaged during shipping/handling.

OTHERWISE, do you have Windows 10? I have an NVIDIA GTX 1080 Ti, but when I first booted into Windows 10, it did not boot off of my GPU (and instead integrated graphics) despite the HDMI (-~-) being connected to it and not my motherboard, and was not visible in device manager. I installed the drivers and rebooted three times. It still wouldn't render. After maybe 20 minutes, it finally rendered my graphics card GPU in device manager, and my resolution changed - it began to use my graphics card, and it has been working great ever since then.

Yeah I'll test with another GPU. For clarification, the GPU has functioned perfectly since I bought it 2 years ago, minus one month.

 

[smorizio]

your gpu might have had a heat failure or your power supply not outputting all the power it needs to get your gpu working. all you can do is try your gpu in another pc and a new gpu in yours.