Installed New PSU but Ran Into Problems

AdvancedApproach

Well-known member
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Couldn’t get a screenshot of the exact error code in time. It stayed on the screen for a split second, literally. Installed everything right according to the manual on my motherboard, PC, and PSU. At first everything was working just fine. Went to shower and came back down only to see my computer completely shut down. Normally after 20 minutes it goes into sleep mode but instead shut down completely. I’ll be looking into what caused the problem.
 
Error 9/3/2025 11:24:36 PM Event Log 6008 None: The previous system shutdown at 10:05:26 PM on ‎9/‎3/‎2025 was unexpected.
Error 9/3/2025 11:24:26 PM volmgr 46 None: Crash dump initialization failed!
Critical 9/3/2025 11:24:27 PM Kernel-Power 41 (63): The system has rebooted without cleanly shutting down first. This error could be caused if the system stopped responding, crashed, or lost power unexpectedly.
 
I would be looking for a loose connection first. It could even be something that is NOT a power connection.....something that you accidentally bumped loose.
 
First you should ensure the PSU is not the culprit by checking voltages in UEFI/BIOS. Then, if your graphics card is connected to the relevant dedicated rails.
 
I would be looking for a loose connection first. It could even be something that is NOT a power connection.....something that you accidentally bumped loose.
I disconnected the motherboard chord and then reconnected it. To me it seemed a little loose, so I decided to ensure the motherboard was securely connected.
What was wrong with the PSU that you removed before installing this one?
For the GPU I want to get the wattage is inadequate. I only had 600w. This one has 850 watts, which is more than adequate.
 
You can try connecting the previous 600 W power supply, if you still have it. See how the computer will behave with it. And based on the available information, you can assume the following options:
- either there is no contact in the connectors somewhere,
- contact appeared where it should not be,
- the new power supply has problems.
 
If everything worked fine on the old PSU, and there were no prerequisites to think that there were any problems with the power supply in the computer itself. There is too little information to give any useful advice.

Can you enter the BIOS? What does the voltage monitoring show?
 
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If everything worked fine on the old PSU, and there were no prerequisites to think that there were any problems with the power supply in the computer itself. There is too little information to give any useful advice.

Can you enter the BIOS? What does the voltage monitoring show?
This is what shows up.
 
As always, go for the stupid easy stuff first such as connections before digging deeper. It's easy to get caught up in the errors and start reading into things. Once the easy stuff is ruled out, dig deeper a bit at a time.

The event viewer messages are normal if the power is removed suddenly. Windows didn't have time to shutdown cleanly, therefore, it complained that it wasn't shutdown cleanly and couldn't record the errors.
 
You might try removing the DDR4 sticks in A2 and B2 slots, make sure EXPO (that is AMD's version of XMP) is enabled for stability, too.
You have mixed sticks, two higher capacity sticks but different speed in A1 and B1. Do it for the sake of testing.
If you decide to keep the small capacity sticks in there, I think you will want to turn off EXPO and see if the system sets all four sticks to the same speed.
Also, the Gigabyte B550 UD AC-Y1 BIOS Ver. FGg has an update to Ver. FGh available on their website.
Those are things I would check. Always better to have all the same brand / speed / capacity (a kit of four sticks) of RAM when using all slots.
 
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