Creating Bootable DVD or USB Imac mid 2010

[NevisIsland]

So I have been working with computers since 1991, but 99.9% Windows and or Linux. I have a friend who has a Imac mid 2010 that I believed shipped with Sierra 10.12. At any rate he hard drive failed completely, (White screen with blinking question mark) so I replaced the drive. No problem there have replaced thousands of drives.

Now it comes time to install the OS, at first I tried to do it via Internet, but no go on a Mid 2010.
I then create a bootable USB using a dmg file, (which I assume is similar to a ISO file) using TransMac. I also created a Dual Layer DVD the same way. I used El Capitan Sierra, and High Sierra. None of them would boot using C, or Option.

Also tried clearing NVRAM with P+R+Option+Command

Now here is the STRANGE thing. Just for fun i stuck a bootablel Linux Ubuntu USB in and the compouter booted and would have intsalled had I wanted i to. The same with a Windows 8.1 64 Bit pro. :O

Desperatley Need help.. Thanks ever so much

 

[oldscribe]

Hi,

Imac mid 2010 that I believed shipped with Sierra 10.12

Think this is not the correct OSX and someone will correct me if not. As one of my MacBooks is a late 2010 model that shipped with Snow Leopard, and from there you can upgrade.

re getting the install disks have a look here.

https://support.apple.com/kb/index?...rt_searchbox_main&locale=en_GB&q=snow+leopard