Help in recovering Imac

[stefanocps]

Hello i have tried to reinstall mac os on y IMac Retina 21.5 A418 (ventura)
I entered in the mac os recovery and tried to initialize the hd, but is seemed stucked on this operation. So i switched off, and now when i start there is no more os, neither os recovery, but it cycle on a error message saying that mac has been restarted because of an error
Moreover, a times the sound of the start disappear, and when it disappear the sound all the schortcut for the boot option (to enter recovery or nboot device or other) don't work anymore. Whatever keys i play it just ignore them
What shal i do?
thank you

 

[stefanocps]

ok i was able to reenter the macosrecovery via wen. This time i could initialize the disk, and i see there is still a disk called "disk image" OS X BAse system, 2 gb.
When i go ahead i can choose to reinstall , and this time i see it try to install macos high sierra(while before was ventura)
After a while there is an error saying aht it cannot contact the server

 

[stefanocps]

ok it seems i must reinstall high sierra formusb then I am downloading the dmg from apple
Now, hot do i put it in an usb drive and have it bootable? Better if in windows thanks

 

[stefanocps]

just found out that i can install ventura