NLM load error after mirror errors FAT on Vol. SYS

[OEBVIPREUSS4]

After a Novell Event message on our clients "Error reading both FAT entries on SYS" our Server was going down and wasn't able to start up again. We made a drive copy from the hard drive and tried to boot from the new HD. We started the server with the -KF8 Option to follow the boot process step by step. When Netware want to load the module DS.NLM, it creates a loop of error messages: "Cannot load Module xxx.nlm before module yyy.nlm was loaded".
Following Modules were involved:
- REQUESTR.nlm
- NLMLIB.NLM
- THREADS.NLM
- CLNNM32.NLM
- NCPNLM32.NLM
- NETNLM32.NLM
- CALNLM32.NLM
- NIT.NLM
- LIB0.NLM
- LSAPI.NLM
- DSAPI.NLM
- NSPNDS.NLM

A vrepair (2+4) of the Volume take no effect. Can someone help us?