"No Boot Device Found" after converting MBR to GPT disk and "roll back" to MBR

[Mao H]

Hello, everyone. I was wondering if there's a way to fix the "No boot device found. Press any key to reboot..." In upper lines it says, "PXE-E61: Media test failure, check cable." When I enter BIOS, the hard disk isn't showing (blank). However, when I run tests on Diagnostics, it is there and shows me that "All tests passed."The thing is that I was trying to install Windows 10 (to one of the partitions of the hard disk, which is MBR) from a bootable USB drive on my laptop, but it required GPT to proceed the installation, so I used a tool called "GDISK" to do the conversion.After real

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