in some instances the failure of the hpdp-idb service may fail to start after services ahve been stopped and restarted or after an applicatio crash (check the event log to confirm App Crash)
run omnisv -stop
then omnisv -status
note that all services are down
next run the task manager or tasklist and note any instances of Postgres and kill these (taskkill PID /T), better yet reboot the server if possible to clear zombie threads
hpdp-idb should now start
open a support ticket if this does not resolve the issue alsong with the pg_logs contents (ProgramData\Omniback\server\db80\pg\pg_log) and any crash dumps from C:\ProgramData\Microsoft\Windows\WER\ReportQueue