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Double boot after AC power reset?

My computer has been doing this for so long I basically accepted it as normal: any time AC power is lost, intentionally or not, the PC takes 2 tries to boot. Never 3, always 2. So if I toggle the PSU or unplug and move the PC, double boot inc.

When it happens, the first try is only a couple of seconds, clicks off, back on, then goes through normal boot instead of fast boot. The Power Plan often defaults back to High Performance too, but I dont know if its related.

Certain BIOS changes (but not all) will cause it as well, when it restarts to apply them.

I finally decided to ask about it because I’ve never found anything, but today it booted on the first try after moving it. For the first time in at least a year, more like two. I removed a couple older HDDs for the moment, and apparently that did it?

The only hint I’ve found online is RAM timings, but I’ve tried all kinds of settings in the course of overclocking, and diagnosing other issues. The double boot has always been consistent until today. I dont miss it… I just wanna understand man…