System won't boot

[VicSoul]

1) MacBook pro 8.1 17inch 2011.
Installed windows 10 on a new SSD. During installation, I accidentally deleted the macOS High Sierra partition.
2)Using a bootable macOS Catalina flash drive, I loaded the old Time Machine image and restored the macOS Yosemite partition. Then I made a bootable High Sierra flash drive and installed macOS 10.13.6.
3)The computer worked for a few days until it crashed when I loaded a powerful guitar into the sampler Kontakt.
4)After that, the macOS system does not boot. The download starts and at 60% of the download a gray screen appears and after a reboot.
5)I tried to restore the old image from Time Machine again, but the system does not boot after the restore either. Did a NVRAM reset. When installing High Sierra, I changed the date to 2018. Nothing helps.
Can anyone help? Please!

 

[ifrit05]

Hold down the cmd and v keys when you boot, it should boot into Verbose mode, letting you see where the system gets hung up at. Report back after taking a picture of that screen.

 

[DeltaMac]

I will take a wild guess - this is a flare-up of radeon-gate.
Your 2011 17-inch MBPro is one of the primary targets of that issue.

 

[VicSoul]

Hold down the cmd and v keys when you boot, it should boot into Verbose mode, letting you see where the system gets hung up at. Report back after taking a picture of that screen.

Thank you so much!

 

[VicSoul]

Thank you so much!

 

[VicSoul]

Thanks everyone for the help! This helped: https://apple.stackexchange.com/que...g-from-usb-drive-with-fresh-os-x-inst#tab-top

 

[VicSoul]

I will take a wild guess - this is a flare-up of radeon-gate.
Your 2011 17-inch MBPro is one of the primary targets of that issue.

Thank you ! You were right