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A Desktop PC built from off-the-shelf DIY parts, rather than a prebuilt from a major manufacturer. These can also be built by an SI using off-the-shelf parts.

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PC randomly rebooting (FM2 socket)

Components:
CPU: AMD A10-6800K Black Edition
IGPU: AMD HD 8670D
GPU: ASUS CERBERUS-GTX1050TI-O4G
MB: MSI FM2-A85XA-G65 (MS-7793)
PSU: Evolveo FX 550 550W (80 PLUS)
Boot Drive: WD Blue 3D NAND SSD 500GB 2.5"

Problem:
PC runs fine, then suddenly falls into booting process, as if someone pressed reset button on case. It happenes randomly, sometimes once a month, sometimes multiple times a day.
Everything except case, CPU and MB is new.
I have tried reseating RAM, power cables and sata cables, cleaning out the dust and reinstalling system. Nothing has worked.

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Hi @andr3where,

Being random makes it more difficult.

What OS is installed, Win 10, Win 11 etc?

Check in Event Viewer for any Critical, Error or Warning events logged at the time that this occurs.

If there are any or there is a pattern of the same events which occurred at the time of the reboot(s), search online using the Event ID and Source information to find out what it means.

To get to Event Viewer in Win 10/11 press the Win key + x key (both together) and click on the Event Viewer link.

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Could be bad RAM, especially upper memory so that when a large amount of RAM is used the error may occur and cause the crash and rebooting. If you have two RAM modules try swopping one out at a time to see if error still occurs. When replacing remember RAM pairs must be matching pairs.

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Thank you for your help, I totally forgot about posting this question, unfortunately the MB died.

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It may be something totally different in your case, but I had exactly that picture when I at some point got what turned out to be a wrong RAM - it was almost similar to what I was after, one digit difference in its timing and I had exactly this - my Mac booted and worked just fine up until a reboot at an absolutely random moment. So if I were you I’d triple check the RAM. I fixed it by getting a Mac compatible RAM - one that had this stated loud and clear on the packaging.

I know you have a PC, but RAM timing can be the root of the problem

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Thank you for your help, I totally forgot about posting this question, unfortunately the MB died.

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Ondřej Dostál will be eternally grateful.
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