Have you recently done any hardware modifications? I had very similar issues which persisted until I realized I had not fully seated the 24pin connector after changing out my CPU cooler. After seating it properly, random boots and reboots went away.
this post was submitted on 07 Dec 2025
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Haven't opened the case in months
How big is your power supply? That sounds like its running out of power and shutdown when the GPU and could spin up
Way over powered, and again this never happened before not even when gaming.
Check your fans and run a temp monitor
They're fine, cpu was probably below 65 C when it happened
You sure it was showing the bootloader and not just kicking you back to your login screen?
I'm pretty sure, at the very least it showed the boot crawl