My Dell PowerEdge R430 came with Windows server 2012 R2 std pre-installed, no media.  Windows broke so I downloaded the eval .iso from Microsoft's evaluation website. I installed the evaluation version and attempted to change the product key to the product key that came with the server. When I type in the new product key, windows said this product key doesn't work.  I've also tried entering the product key by command line using this command: DISM /online /Set-Edition:ServerStandard /ProductKey:XXXX-XXXXX-XXXXX-XXXXX-XXXXX/AcceptEula

How can I get Windows 2012 R2 to take the original product key?