System restarts normally, but needs to switch the power supply unit on and off before it powers up again
System restarts normally, but needs to switch the power supply unit on and off before it powers up again
I recently upgraded my motherboard to a B650/7800x3d/DDR5 6000 and installed a new RMx850 PSU. After putting the build together, I noticed a problem: I can post only after restarting from shutdown, but not when I power off, unplug, and plug it back in. A simple restart works fine otherwise. Does anyone have experience with this issue or know where to begin troubleshooting?
Here are the details you provided:
- Mobo manufacturer: Mobo
- Memory manufacturer: Memory
- Part number: Got the Corsair RMx850 PSU
- Possible issue: Could be related to the motherboard, memory, or AMD EXPO
Check the bios and adjust these parameters in the "Platform Power" area, specifically Power Supply Idle Control Power Loading.
Could the issue stem from missing the 4-pin link on the 8+4 CPU setup? It seems you’re only linking the 8-pin CPU.
Suggest returning to the standard BIOS configuration. Connect the 4-pin CPU power connector to receive the complete 8+4 CPU power supply. Consider any adjustments that could improve its ability to initiate a shutdown and boot process. Once functioning, activate PBO, run tests, then enable EXPO for further evaluation. By proceeding slowly, you'll identify the exact failure point. I believe starting with these steps would be the best approach. I checked Corsair RMX RM850x and found modular connectors suitable for 8+4 power. Please confirm if we're making assumptions—we're attempting a remote debug. Also, the Gigabyte B650 Gaming X AX V1 manual page 19/41 mentions a sequence of LED changes indicating UEFI BIOS transitions during memory training, PCI link setup, and video initialization. Once the video display appears, you can review details on the screen. It seems your board may not complete that sequence after power cycling... After connecting a 4-pin and resetting the BIOS to defaults, attempt booting and then shutting down to isolate the issue. If none of the status LEDs illuminate, it suggests the UEFI BIOS never started. If any LEDs remain active, they might point to the next failure point.
There’s no chance... I’m dealing with something close to what you described, right? You mentioned having one of Micro Center’s bundles, specifically the 7900X in late February. It seems like both your systems share a similar problem. On my end, it’s more unpredictable—sometimes it starts after a hard reboot or when the power supply disconnects. At first I thought it might be linked to my main monitor, which has been acting up since purchase. But then it spread to my second monitor. I suspect the issue could be with the GPU, video ports, or the motherboard itself, possibly stuck in a loop.
I replaced both the board and RAM, but the memory LED stayed lit during startup for over ten minutes before moving on. Still, the same trouble persists with the new motherboard and RAM. It might have been a defect in the first kit, or maybe it’s related to the monitor I’m using. Even though I use the same PSU, the problem remains after a proper shutdown.
I’ve tried reseating RAM, cables, updating BIOS, and even reverting updates, but nothing worked. I found a temporary workaround: disconnecting the display cable before the startup sequence and reconnecting once the logo appears on the second monitor. This usually restarts everything until I power down or hibernate. It’s unclear if this helps with just one monitor, but it’s the best I’ve had so far.