Windows 10: GPU keeps working (fans spinning) for a few seconds after shutdown

I disagree that every bios update is necessary. You can't lump every update in a necessary category, it just won't work that way.

For example, MSI puts out a bios update that makes it so that their mainboard can see a 4TB hard drive, without it, the mainboard doesn't know that hdd is there. I have no intention of using a 4TB HDD, so that is an unnecessary bios update that would not be worth taking the risk to update to. (of course if you want to use a 4TB HDD and your bios doesn't support it, then you'll find an update to be a necessary update) weigh it each time, simple as that.

An example of when it would be necessary, perhaps for a security update that says that some program has the ability to write to the bios in some way and the security update will prevent that. Okay, in that case it might be a really good thing to install it. Or in the case where some hardware is simply unusable by your computer due to a bios update being necessary, in that case if you use that hardware then it might be worth updating your bios. But not every bios update is a necessity In My Opinion.

So, no it's not always necessary, you simply have to weigh what it fixes against the possibility of it bricking your mainboard.

Honestly it goes both ways, there are those that wear tinfoil hats that believe every bios update is a necessity (otherwise OMFG my computer won't be able to use that $9.874.00 piece of hardware that I have no intention of ever using) that HAS to be performed as there are those that wear Santa hats that believe it's not an absolute necessity that every bios flash available has to be performed. It should be taken on a case by case basis and weigh the benefit of the update against the possibility of something going seriously wrong.

I certainly wouldn't take the chance of updating the bios if it was on my one and only computer and I didn't have money to get a new mainboard if something were to go wrong, that would simply be in my book... foolish.

 

I disabled hibernate and that made things even worse. Now my PC shuts down every second try. The first try, fans just keep spinning until I hear the MOBO beep and the PC boots back on, just like on a normal boot. Upon entering login screen and shutting down from there for a second time, the fans just spin for a second or two before the PC shuts down.

 

What about re-seating the card? You might have also unplugged some little jumpers on the mainboard (the ones setting the USB power - consult your motherboard manual and check all is in order).

For the software part, in BIOS disable power on by usb/ps2 devices, wol, set power state after fail to off, set suspend mode to S1. In Windows, open Device Manager, go trough all peripheral devices (mouse, keyboard, other usb devices) and under Power Management tab, uncheck Allow this device to wake the computer. Do the same for network devices (and under Advanced tab, set Wake on... disabled).

Talking from experience, when I've lost stand-by ability. PC would automatically boot up again unless full shutdown. Then I've determined it did not happen with the mouse and keyboard disconnected so the likely suspect was my PSU not providing the right juice to +5vsb. Once I've set all USB ports to +5v from +5vs(tand)b(y) by their mainboard jumpers, issue was fixed. After a while PSU recovered and now it's working again with +5vsb.

 

Re-seated the card, that didn't help. I did however remove a USB connection cable from the motherboard during cable management, but I was sure I plugged it back in and even checked that it's in place.

I just unchecked all my peripherals and the network adapters. I'm going to shut down the PC now and see how that works. If it's not fixed, I'm going to try the BIOS suggestions you made.

Also, should I set my BIOS settings back to default? Just in case?