second opinion.. advice..

plug it in outside of the box.. so you can hear it.. does it start up ?
I see many hard drives fail due to their interface boards.. failure to detect at bios startup is the most common fault that you'd see if the circuit baord was at fault. you know there are actually inline fuses on many hd interface cards.. so always check those.. they'll be near the input pwr connector.

and I've been lucky in a lot of cases where finding an identical drive and swapping boards have allowed me to get folks data back.