SGI retrocomputing

Some time at the end of the nineteen hundreds, I took the Indy and O2 that I had liberated from Netscape and retired them to a shelf in my laundry room. They worked fine at the time that I did that! Now, not so much. Neither boots. I got an OSSC that lets the Indy display to a modern HDMI monitor (earlier attempts with other scan converters had failed) but the Indy says no SCSI drive, no ...