DVD writer cable not found

Hi There!
When I buy a computer from the shop then I did not buy my DVD writer. I mean that it will be no issue for me in the future. After passing some months suddenly I need to set up my windows. Then I immediately go to a computer shop for buying a DVD writer.

After buying DVD writer when I open my PC for activates it. But I cannot find my DVD writer cable in my PC. Only one cable is matching and other cable is not matching.

So I need that’s cable to activate it.
Please help me with helpful answers.
