The new NetWare 4.11 server running NW4SP7A and Backup Exec 7.11
operate smoothly until restoring NDS schema, root, and selected
non-operating-specific directories to the sys volume.

After the selected restore, the server is restarted and the
system dynamically enters into VREPAIR.

How can I solve this problem?

I have already swapped out IDE hard drive, ADAPTEC AHA-3940
SCSI controller, and ribbon cables. Also, DSREPAIR runs without error.
The motherboard is an INTEL T440BX.