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no boot device

Cloudio
Level 7

hello guys i have a problem.
I bought an asus prime h510m-a motherboard updated to the uefi 2404 x86 version as you can see from the attached image 1.
Once connected to my hdd and my dvd player i notice that even though i see it, these do not appear in the boot menu options, so much so that when i restart the pc, the uefi initial screen always returns. see attached image 2).
I specify that on the hdd a version of win7 64 bit updated to windows 10 was installed with a non uefi motherboard.
I would like to point out that i am aware that in order for the hdd on which the system was installed to work it must be converted to gpt, how can i convert and install windows if i do not have the possibility to access either the hard disk or the dvd player?

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1 REPLY 1

NOSNHOP
Level 7

@Cloudio: Do you have CSM enabled? (Compatibility Support Module)
This would be required to boot if not GPT already.