How do I turn off start up sound

[URDRWHO]

Ok I give up. I looked in Application and System Notifications but there is nothing about the sound when it boots up. I don't want to wake the house when I get on the computer at 2AM.

Kubuntu 12.04

Never mind I found it. It was buried deeper than I thought. I saw event source and didn't know that clicking on it gave other options.