Hi @Scott, welcome to the IBM community.
Since you're trying to revive an IBM iSeries eServer 9406-810 and getting an error code of B1634605, there are chances that the problem lies in HDD. I would recommend you seek help from a reliable IBM iSeries support service provider. By seeking help from an expert, you can revive your IBM iSeries eServer in a quick turnaround time. In my opinion, the best way to move forward is to seek help from seasoned professionals who have rich hands-on experience working with iSeries Servers.