As I suspect this to be Gigabyte issue, I post this to the motherboard forum, however admins please moderate as needed.
I have X570 Aorus Pro, Ryzen 3950x. This issue started after upgrading my processor to 3000 series.
So if I choose Sleep from Start menu, the computer shuts down instead of sleep. It is peculiar behavior, because first it seems it goes to sleep normally. But if I then press a key or mouse button to wake it up, it the fans spin up and it is same as total shutdown.
I had the same issue and was able to fix it by disabling “C6 deep sleep states” in the BIOS settings. I’m on an AsRock x570 with Ryzen 3000.
This prob isn’t your issue, but thought it was worth mentioning:
On a side note, I’ve seen similar behavior after installing 4x 8gb 3200/CL16 DIMMs. It would go to sleep, but after trying to wake the PC up it would just reboot. Slowing the memory down a tad fixed the issue.
I would look in your motherboard manual, there should be a chapter on your motherboards BIOS settings. Since I only have an Asrock x570 Tachi motherboard, I won’t be of any further help.
@Shadowbane’s solution would be best but what I usually do is just poke around in the BIOS settings till I find whatever I’m looking for. It’s not buried super deep on AsRock’s setup IIRC
I download the manual for Ryankocool’s motherboard, I think the setting he is looking for can be found by getting inside his UEFI, then choosing Tweaker, choosing Advance CPU Settings, setting Power Supply Idle Control to Typical Current Idle. What this setting is supposed to do is shut off al C6 states. @nyankocool I would contact Gigabyte tell them your problem and the possible solution, and see if you apply the fix if it will hurt your Motherboard. I give this caution because, in my opinion, the AMD Zen platform is very finicky. In fact, my next desktop platform is going to be Intel.
So you were able to log into Windows after making the change, I am surprised Windows loaded up. There must be other settings in the UEFI that need to be changed, as to what those changes are, I don’t have a clue. The next step is to contact Gigabyte and see if they can help you.