IMac Sound Disabled Occasionally On Start Up?

So as the title says when I boot up my iMac, on occasion, it seems to have the "Updating" Status bar, then the mac boots normally, then the sound is disabled. As I said though this dose not happed all the time but when it dose the only way to fix it is by rebooting the iMac once again. Its not a major or super urgent issue but can be quite an annoancy.
If anyone else has this issue or knows how to fix it some knoladge would be gladly appreciated!
Thanks!
Processor 2.5 GHz Intel Core i5
Memory 8 GB 1333 MHz DDR3
Graphics AMD Radeon HD 6750M 512 MB
Software Mac OS X Lion 10.7.3 (11D50b)

This is interesting - I had a similar "scare" a few times in the past until I "accidently" found the solution. If your volume is set to "mute" before you reboot, the startup chime will be muted as well. This may not be the specific scenario for you, but it might be a start =)

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IMac Sound Disabled Occasionally On Start Up?

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