Passes POST, but I hear *no* startup sound?

[rob5]

I took my Mac Pro in yesterday to fix a memory issue. They took the computer in the back so I couldn't see what they were doing.

Before going there the startup sound would come on fine. Now when I brought it home, I hear no startup sound at all when I boot my MP. It passes POST fine so I know that's not the issue.

What could be wrong? Could there be a cable somewhere on the mobo they forgot to connect?

Any help would be appreciated.

[adrianblaine]

I know the Startup Sound does not play if you have OS X muted before restarting.

[rob5]

I know the Startup Sound does not play if you have OS X muted before restarting.

It's not muted.

[MacsRgr8]

You could reset the PRAM (turn the Mac on while pressing: (<COMMAND> , <OPTION> , P , R), and after the first "reset" the sound should be set to default, and then you should hear the startup sound.