Imac stuck on loading screen and key combinations aren't working

[yeahz]

I would reset my imac but nothing seems to work. I already tried every key combinations but it doesn't work I don't know what to do anymore. I have made a boot usb, but I don't know how to activatie it. The only keys are working is D and C on de by the start. The imac will land on the loading screen and then stuck on 100%.

I have tried to reset the NVRAM/PRAM but i don't see anything. Than i tried to use cmd + r and also nothings. I have tried all of these commands on this link https://support.apple.com/nl-nl/HT201255 but only D and C was working.
the model number is MD095 late 2012
with the program Transmac I made a boot usb for mac but I don't see if it does anything.

macos

 

[Cory Cooper]

Hello and welcome.

I would guess that it is the way the bootable installer was made with TransMac.

-It is an iMac (27-inch, Late 2012), correct?
-That model supports up to macOS 10.15.7 Catalina.
-Which version of OS X/macOS are you trying to install?
-Are you using a Bluetooth or USB wired keyboard?
-Did you try Option-Command-R or Shift-Option-Command-R to start up from macOS Recovery over the Internet?

C

 

[yeahz]

Hello and welcome.

I would guess that it is the way the bootable installer was made with TransMac.

-It is an iMac (27-inch, Late 2012), correct?
-That model supports up to macOS 10.15.7 Catalina.
-Which version of OS X/macOS are you trying to install?
-Are you using a Bluetooth or USB wired keyboard?
-Did you try Option-Command-R or Shift-Option-Command-R to start up from macOS Recovery over the Internet?

C

yes it is a imac(27-inch, late 2012). the version i tried to install is macOS HighSierra 10.13. i use a wired keyboard and the keyboard is working. i tried all the commands but they aren't working only commands d and c are working.