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If the problem is with your startup script than adding 3 won't make a difference because the oracle startup is normally run during runlevel 3 and 5. I suggest to boot the system into single user mode. Simple add the word "single" as you did with "3" instead. Then check your startup procedure. Your startup script might be causing a loop.
See here for a working startup script, which I posted yesterday:
About dead service (oracle 11g automatic startup)