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I won't give up, but unfortunately for now, I am still stuck. Thank you for your help however :)

I have tried all the USB ports, I have tried a different USB key (8Gb). I tried by disabling USB3 and enabling in BIOS. I am not sure if my Radeon HD6450 needs a fake ID? How could I know for sure? Do you know if my board would allow UEFI booting? The thing I have not tried is to create the USB...

I already had unchecked all in ACPI as you suggested it and that was the result I had posted earlier. I just changed "Rt Variables>CsrActiveconfig" value from 0x3 (= SIP Partially Disabled) to 0x67 (= Fully Disabled). Unfortunately, I still cannot go further, the screen goes to sleep at the...

I cleared all the [√] in the ACPI section, I was trying to troubleshoot. I [√] the Inject USB and FixOwnership. I am stuck at the same place:

Here is the compressed EFI

I created a USB boot with Legacy BIOS option (not UEFI). Is there still a compressed EFI folder on the USB installer? If yes, how do I get to it? All I can see is an EFI-Backups folder with nothing in it. Thanks for your help.

No, it is connected to a USB 2.0 port directly on the motherboard.

Hi all, I am trying to install a fresh Sierra downloaded today. I am installing using a USB 32Gb Lexar drive. Mobo: GIGABYTE GA-H61M-USB3-B3 CPU: XEON E3-1280 8M Cache, 3.50 GHz - LGA1155 Graphics: Gigabyte GV-R645SL-1GI (AMD Radeon HD 6450 GPU) I tried using the options when choosing boot...