Oracle Database Discussions

I have just recently upgraded our database from 10g to 11g on a Linux RHEL4 x86-64 OS. I'm trying to convert from using huge memory pages to automatic memory management. I've mounted the /dev/shm with the maximum amount of shared memory to be used. My ASM instance on the same server starts up without any problems and utilizes the new shared memory space. But when I try to start the production database instance after changing the memory_target parameter to a non-zero value, I get the following error:

SQL> startup mount pfile='$ORACLE_HOME/dbs/initdatatrak.ora'
ORA-27103: internal error
Linux-x86_64 Error: 2: No such file or directory
Additional information: 27129
Additional information: -1
Additional information: 3

Any ideas what my problem might be?