B850m suddenly dead
Printed From: ASRock.com
Category: Technical Support
Forum Name: AMD Motherboards
Forum Description: Question about ASRock AMD motherboards
URL: https://forum.asrock.com/forum_posts.asp?TID=113397
Printed Date: 01 Feb 2026 at 3:57pm
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com
Topic: B850m suddenly dead
Posted By: LyleDodd
Subject: B850m suddenly dead
Date Posted: 30 Nov 2025 at 11:53pm
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Hello After 4 months of working fine my PC has suddenly died and not able to power on at all, no fan or PSU action , nothing. Just dead ASRock B850m AMD 9700x AIO Pump I had not updated the bios out the box, and I wonder if the issue is the know issue of ASRock killing AMD 5 9000 chips? But even if the CPU did die, would this cause no power to the mobo at all?? I have tested every other part but the CPU , and all other parts work. It's not PSU or case switch. Help |
Replies:
Posted By: Xaltar
Date Posted: 01 Dec 2025 at 12:29am
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The CPU can trigger a power safety and prevent power on yes, if something inside the CPU has shorted out. If a power safety has triggered for another reason and not cleared it can also cause the system to not respond to the power switch. You can try the following to rule that out: 1. Disconnect the system from power 2. Disconnect the PSU from the board 3. Disconnect power from all devices attached to the board 4. Leave the system in this state for a few hours (I usually leave it over night) Then reassemble and see if the safety has cleared. If not then you can remove the CPU to check if it has any obvious damage. It looking fine isn't a guarantee that it's ok but it does rule out a more catastrophic failure. If the system does not power on once you reinstall the CPU then I would begin the RMA process for the CPU and possibly the board if it has taken any kind of damage to the socket. The known issue is exceedingly rare despite the media over focus. I have only seen a small number of cases reported here on the ASRock official forums which should be telling. The upside is, if you are one of the unfortunate few, the process of getting it sorted should be pretty straight forward and not cause you any headaches as AMD and ASRock are both taking the issue very seriously. Good luck and let us know how it goes. ------------- 
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Posted By: LyleDodd
Date Posted: 01 Dec 2025 at 1:29am
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Thanks Just to clarify before I start disassembling everything Let's say everything was plugged in correctly, however the CPU was not installed, should power still come on to the PC case. If no CPU present at all |
Posted By: Xaltar
Date Posted: 01 Dec 2025 at 4:48am
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AFAIK the board won't power on without a CPU installed either. -------------
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Posted By: LyleDodd
Date Posted: 02 Dec 2025 at 2:01am
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I have concluded the CPU is no longer working I have started the process of AMD replacement Regarding the ASRock motherboard, it is 4 months old and as far as I know perfect condition. Do I start a refund process with ASRock or Overclockers UK where I bought it? I suspect it is well out the 30 warranty period with Overclockers. Sorry I'm new to this so unsure what to do. |
Posted By: Xaltar
Date Posted: 02 Dec 2025 at 5:25am
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I would contact your retailer (Overclockers UK) and ask what they recommend. In all likelihood the board is absolutely fine. That said, it is your system and your investment so if you feel uncomfortable using it with the replacement CPU then by all means take whatever steps you feel you need to. From what I have been able to piece together I suspect there is an issue with some AM5 9k series CPUs, possibly bad batches or some such. ASRock seems to have had more failures but other manufacturers have also had reported incidents so I highly doubt it is the actual boards, particularly since there have been 0 cases involving the 7k CPU series on the same boards. Ask your retailer what they would recommend/permit. I am sure they will have some kind of policy in place for the issue. I suspect it will be fine with a new CPU but if the CPU is from the same batch it may still be a risk. This is an annoying issue for all parties, particularly since no one seems to know or isn't saying what the exact cause is. My money is on AMD as if it were a single board manufacturer no doubt they would have been thrown under the bus completely by now. None of the board manufacturers would risk making AMD angry however. -------------
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