480gb ssd DOA?

SSD (Solid State Drives) All Other SanDisk SSD
2

You probably have to initialize and format it. 

Start -> Search -> “Create and Format Hard Disk Partitions” 

You’ll open the Disk Management window, look for your new disk and “Create New Simple Volume”

http://www.youtube.com/watch?v=CZpeEmF90XA

Hope this helps.