hardware fault on SGI Indigo?

Hi everybody, I have an old SGI Indigo (IP12) which refuses my attempts to populate the harddisk with Irix 5.3. The harddisk doesn't boot, so I assume it to be empty. I get sashIP12 and fx.IP12 to load from cd, but using fx with that hd fails: SGI Version 5.3 IP12 Oct 31, 1994 fx: "device-name"= (dksc) fx: ctrl#= (0) fx: drive#= (1) ... opening dksc(0,1,) dks0d1s10: Drive not ready: RAM failure, ASQ=0x80. fx: warning: Failed to open dksc(0,1,10) SGI Version 5.3 IP12 Oct 31, 1994 (and the same again, if I want) Is it trying to open a non-existent partition dks0d1s10? Is it a software-fault? If it's a hardware fault: What's broken: hd or ram? The hd is in the bottom drive bay. After my enter keystroke in line 4 (drive#=1) the led flashes for a short time and at the same time (or maybe some millisecconds later) the error message appears. The error isn't very meaningful to me. Does anybody know about the problem or does have any hints? Thanks in advance, Fabian