Oracle 9 installation problem

[Indira Aramandla]

Hi

The reason could be that "alert_sid.log" could not be written to which is located in the "background_dump_dest". It is defined in init.ora file, please make sure that the directory exists and oracle user can write to this directory.

By default the "background_dump_dest" is located in ???ORACLE_HOME/rdbms/log" unless specified elswhere in the "init.ora" or the "config.ora" files.

If oracle cannot write to this file then the "lgwr" process dies, which in turn causes the "pmon" process to die and this will result in ???ORA-00443: background process "PMON" did not start???.

[Liadi]

I checked alert_sid.log and found no problem with his permission.
also I rebooted the machine so it'll be clean.
when I tried to load an existing database I get this message:
SQL> startup
ORA-00443: background process "SMON" did not start
ORA-27300: OS system dependent operation:fork failed with status: 0
ORA-27301: OS failure message: Error 0
ORA-27302: failure occurred at: skgpspawn5
when I try to shut it down I get this:
SQL> shutdown
ORA-01034: ORACLE not available
ORA-27101: shared memory realm does not exist
HP-UX Error: 2: No such file or directory

I also can't install new satabase (smon error).
I checked the kernel parameters and they're all fine, I already run oracle9 databases with the same configuration.
I'm realy desparate on this. Any suggestion would be a great help

[Liadi]

Can anyone help?