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Power supply rails remaining on after shutdown causing boot issues?

Joined
Nov 3, 2022
Messages
142 (0.15/day)
System Name Every cuss word I can think of, and a few more I've made up
Processor Dual System - Ryzen R9 5900X / Ryzen R7 1700
Motherboard (R9) Gigabyte B550 Aorus Master / (R7) MSI B450M Gaming Bazooka
Cooling Scythe Mugen 5 Black Edition for both
Memory (R9) 2x16 Patriot Viper 4 Blackout PV432G320C6K (3200) / (R7) 4x8 HyperX Fury HX421C14FBK4/32 (2133)
Video Card(s) (R9) Asus Tuf RTX3090 24GB / R7 / EVGA FTW RTX3060ti 8GB (for now)
Storage (Primary) 1TB WD Blue SN5x0 M.2s, 8TB / 6TB WD Black, 2TB MX500, Pioneer BDR-212DBK ODD
Display(s) 75" Hisense A6 (60 hz)
Case NavePoint 15U Networking Cabinet
Audio Device(s) (Both) Onboard RealTek audio, PreSonus 24c interface
Power Supply (R9) Corsair RM1000x / (R7) Corsair RM750x
Mouse Logitech K520
Keyboard Logitech K520
Software LibreOffice, BeamNG.drive, Classic Doom and variants, ATS, NCH VideoPad, OBS Studio, MPC-HC, iCUE
Specs:

Board: Asus Tuf Gaming B550-PLUS
CPU: R9 5900X
SSD: WD Blue SN570 1TB PCIe3
HDD: WD Black 8TB
Cooler: Scythe Mugen 5
RAM: Patrtiot ‎Viper 4 Blackout PVB432G320C6K
GPU: Asus KO-RTX3060ti-8GB-OC
PSU: Corsair RM850x

Issues from day one in Mar 2022. An issue more annoying than troublesome, has been that even with Armoury Crate set to disable the GPU and motherboard ARGB on boot, both cycle rainbow after shutdown unless the PSU rocker switch is turned off.

More problematic, were infrequent random crashes, fail to wake from sleep mode, no-video boot every 8-12 cold starts. Issues seemed to go away replacing the original Ballistix kit used with the current Patriot kit. Has run well in the four months since, though I rarely shut down or restart, enabling sleep mode when not in use. But about a month or so ago, failed to wake from Windows sleep.

Today, the power failed. UPS caught it. Did a safe shutdown and killed the power completely to prevent a surge. After power was restored, it again started up with no video. Hard shutdown via power switch. BIOS forced me to run setup on power-up, where I found the date reset to 1/1/2019 (board was manufactured 1/2022?). Isn't the CMOS battery supposed to maintain this?

After thinking awhile, the following occurred to me.

If the board and GPU's ARGB are cycling on shutdown, that would suggest the rails for PCIe 6+2 and 4+4 CPU power are staying live after the PC shuts down. Is this power supply supposed to supply 4+4 and 6+2 after shutdown? Doesn't seem right to me, and it would explain some things.

Because I can see where if the CPU power and GPU power never turn off, the card would never fully power down and reset, which might prevent re-establishing communication between it and the board, explaining the no-video start. The memory likely only exacerbated this. And what is up with the system date resetting even with the CMOS battery installed?
 
Last edited:
Not sure what is going one with your system, but there clearly are some problems.

First, understand the ATX Form Factor standard dictates that all ATX PSUs will maintain +5Vsb standby voltage output, distributed to multiple points on the motherboard, including RAM, USB ports, the NIC and elsewhere. The only time this is completely removed is when the PSU is unplugged from the wall, or the PSU's master power switch (if it has one) is set to Off or 0.

Second, if your date is resetting, the most likely cause is a weak or failed CMOS battery. If you replace the battery with a new one, and the date still resets, you have a faulty motherboard.
 
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