Solved Can't start the installation from OC Picker

[drxvmrz]

Hello!
When I boot in picker, can't choose any variant to boot.
After the picker is loaded it issues the message "Timeout" in "Choose the operating system:" field after 1 sec (fig. 1).
And I can't choose any option in Picker (USB keyboard).

When I try to boot through the GUI OC (OpenCanopy.efi + PickerMode: External) it shows me a loadscreen but it disappear after a little bit time. (No photo, it disappears too fast and then it stuck with only black screen)
At first I tried the Dortania's guide to troubleshoot my keyboard, there was no any effect. The logs file contain the next messages for all tries to boot OC:

00:000 00:000 OCM: Failed to start image - Already started
00:157 00:157 BS: Failed to start OpenCore image - Already started

On Dortania's guide it seems as conflict with Windows bootloader but there is a clear and erased HDD without any bootloaders

My system:

CPU: FX-4300
GPU: GTX 650 (1 Gb)
MB: Biostar a78lr-m3s
RAM: 16 Gb DDR3
HDD: Seagate SkyHawk ST1000VX005 (1 Tb)

My EFI-folder is attached below:

 

[ExtremeXT]

Hello!
When I boot in picker, can't choose any variant to boot.
After the picker is loaded it issues the message "Timeout" in "Choose the operating system:" field after 1 sec (fig. 1).
And I can't choose any option in Picker (USB keyboard).
View attachment 11203
When I try to boot through the GUI OC (OpenCanopy.efi + PickerMode: External) it shows me a loadscreen but it disappear after a little bit time. (No photo, it disappears too fast and then it stuck with only black screen)
At first I tried the Dortania's guide to troubleshoot my keyboard, there was no any effect. The logs file contain the next messages for all tries to boot OC:

00:000 00:000 OCM: Failed to start image - Already started
00:157 00:157 BS: Failed to start OpenCore image - Already started

On Dortania's guide it seems as conflict with Windows bootloader but there is a clear and erased HDD without any bootloaders

My system:

CPU: FX-4300
GPU: GTX 650 (1 Gb)
MB: Biostar a78lr-m3s
RAM: 16 Gb DDR3
HDD: Seagate SkyHawk ST1000VX005 (1 Tb)

My EFI-folder is attached below:

Have you tried this: https://dortania.github.io/OpenCore...sues.html#can-t-select-anything-in-the-picker

Once you fix the keyboard, press space in the picker and select the option with (external) (dmg).

 

[drxvmrz]

Have you tried this: https://dortania.github.io/OpenCore...sues.html#can-t-select-anything-in-the-picker

Once you fix the keyboard, press space in the picker and select the option with (external) (dmg).

Yes i've tried these guidelines to make my USB-keyboard is available
I made sure my keyboard is working... If i push an ENTER key when picker first appears, it issues me "OK" in "Choose the operating system:" field instead of "Timeout". But then nothing happens either, and it stuck. The log file contains the same messages about failure of starting image.

 

[Edhawk]

Check your OpenCore EFI is arranged correctly, i.e. that all the necessary sub-folders are located within the OC folder and your EFI folder just contains the Boot and OC folders.

This is the correct layout for the EFI folder and OC sub-folders.

 

[drxvmrz]

The solution of this is a press SPACEBAR key immediately after picker appears. It shows me 3 (with DMG) vars instead 1, lol...
Messages signaling about attempts to boot Mac OS are appeared)

And i've solve it too. My PC was masked as iMac14.2, but this Mac doesn't support Big Sur. I've remasked it as MacPro7.1, and messages disappear