Imposible continue the installation of Snow leopard 10.6 on a 1TB external hard disk, what can I do?

Imposible continue with the installation of Snow leopard 10.6 on a 1TB external hard disk. I did the same last year and I continued working but suddenly appeared the simbol with a folder and a question mark and I know this is a problem so I click in the format option to the hard disk and when I tried to install again Snow Leopard, 'cause I want to recover my backups with Time Machine, I couldn't continue because the installation didn't respond to the click in the Utilities option or to next step > continue . Please, What can I do? I'll wait for your answers. Thank you so much in advance.

Hello Melophage,
It is the original hard drive which should have been erased by the previous owner. The problem is, I cannot access it without any OS installed. Or maybe there is a bootable USB or DVD that can do it ?
Just an indication: when I boot without CD inserted in it, it shows a grey folder icon with a questionmark like this one:
Thank you for your help
PS: Yes, I am interested by the replacement pair of grey installation DVDs for my model. Where can I purchase this ?

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