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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?

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Posted · Original PosterOP

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?


PC:

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CPU: Ryzen 3 1300x @ 3.8ghz 1.2875 v | GPU: EVGA GTX 1070 Superclock | MoBo: MSI b350 Tomahawk | RAM: 2x4 Kingston HyperX fury 2666 @ 3033 16-18-18-36 1.3 volt

Case: NZXT S340 Elite | PSU: EVGA 650GQ | SSD: Kingston A400 240GB | HDD: 1TB WD blue | OS: Windows 10 Pro 1903

Laptop:

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HP Envy x360 13

APU: R7 2700u | RAM: 8GB | SSD: 240GB NVME | Display: 1920*1080 IPS touch with pen | OS: Windows 10 Home 1903

Accessories:

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Keyboard: Logitech G810 Orion Spectrum | Mouse: G602 | Monitor: ACER R240HY | Mic: Blue Snowball iCE | Headphones: Creative Aurvana Live! 

AMP/DAC: FiiO E07k | Phone: iPhone 7+ 128gb Matte black

 

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