[CentOS] fsck -fvy ?

Dear All
My server got inconsistency from sudden power cut that I fixed it with #fsck -fvy /dev/hda at the maintenance prompt . But after reboot, one of the installed applications is preventing it from booting up (as can be seen in the boot up process list). Can you please let me know how can I remove it from the boot up list to reach the root user prompt and then re-install it again ?
Thank you