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Is there any reason a PC would not find a boot device after being unplugged from power for a few hours other than a dead CMOS battery?

RGProductions
By RGProductions
in Troubleshooting
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I have a slightly older PC that normally works perfectly fine, but after being disconnected from power for a while, it does not find a boot device. I'm not sure what fixes it, but either unplugging the drive and plugging it back in, or changing the boot order in the bios fixes it, and it always works great after. Can you think of any reason other than a dead CMOS battery that this would occur? I just replaced the CMOS battery. I should also note that it works perfectly fine after unplugging it, and letting all power drain, and then plugging it back in within 5 minutes. Thoughts?

M1 MacBook Air 256/8 | iPhone 13 pro

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