Why does Asus desktop Computer always boots into BIOS first?

Hello, according to your tests the main problem is your HDD, I believe if you replace it with another one it will work perfectly. So why it’s booting normally when you exit the BIOS? My theory is some electronic component drawing more current than usual when it’s cold (ambient temperature) and during the boot process (push power button to BIOS) it will heat up, this rise of temperature will increase its resistance and consequently the current flowing inside it will decrease and when you restart again the component is already warm and the Motherboard will detect the HDD.

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I agree with you. I connected the HDD to another pc which is functioning normally and it couldn’t boot either when I pressed the power button. So the HDD is the very culprit. thanks a lot.

由 taxi huyenbi 完成的 2020年9月26日

@taxihuyenbi you're welcome if you have anything else you can reply anytime :)

由 Vertinhol 完成的 2020年9月26日

Yesterday I did an experiment: connecting that HDD to another healthy windows 10 PC and pressed the power button, the BIOS couldn’t find any bootable device, so the HDD is the culprit here.

I reinstalled windows 10 home 64 bit from a DVD on that HDD to make sure it’s a clean installation. I shut down the PC and waited for 1 hour and pressed the power button: boot into BIOS again and the HDD was not on the Boot menu!

I opened cmd and run diskpart then list disk as other guys said, there I found that the HDD is MBR, but my Asus motherboard is UEFI (Asus H81M-R), so I tried to convert the HDD to GPT.

Then I go to BIOS setting and reset it to Default – save – exit.

I am shutting the pc down for 1 hour then turning it on again to see if it works and let you know the result. Thanks for all help.

由 taxi huyenbi 完成的 2020年9月26日

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