If you do get it fired up again I would recommend ditching the Seagate OS (which is 100% unsupported) in favor for something like TrueNas (FreeBSD / Linux) or OpenMediaVault (Linux). As Seagate has discontinued it's OS it means your NAS is open to more vulnerabilities especially if connected to the internet.

I've done a quick Google and it appears there are installation guides for it. It simply has a standard x64 processor.

If it is however fully dead then consider getting a Synology for ease of use.