HELP - My sound is gone, both audibly and in Prefs

My sound has crapped out on me. I thought maybe my speakers had just gotten unpluged but it's everything. In the Sound section of Prefs. It no longer shows the digital and analog options... it doesn't show anything in the box at all.
Is my sound board dead? I didn't know Macs even had sound cards at least stand-alone units. Any help would be greatly appreciated.
-WW

Hi
From what did You import Your movie ?
• miniDV tape Camera - FireWire
• .avi, .wmv, .mpeg4, etc
My general list on this - May be not Your problem at all ?
*No Audio in iMovie*
Most common origin is use of audio from iTunes.
Work around -
• Select needed audio to one new playlist
• Copy out this as an Audio-CD .aiff (not .mp3)
• Use this in the movieproject
Other origins are
1. strange/ailient file formats as -
• .mp3, .avi, .wmv etc
• Convert them into .aiff 48kHz 16-bit and use this
2. the Mac is set wrongly in regard of midi -
• Close iMovie and other programs
• Start GarageBand
• Make a new GB-project and play some notes
• Close GB and Save
• Now try iMovie again
3. No audio when playback in iMovie 1 to HD 6.
a. in iMovie pref - deselect ”Playback via Camera”
b. in System preferences - see that Audio out is not set to zero. Mine often does this
without me knowing why.
Stuttering audio and video
1. FileVault is ON - Turn it off
2. More than 50 audio files in a movie-project
Mix down to one audio clip
3. Project is stored on one (USB) external hard disk - should be a FireWire one
4. the External hard disk is not Mac OS Extended formatted - but
UNIX/DOS/FAT32/Mac OS Exchange and this will not work for Video.
5. To little free space on internal boot hard disk.
I go for a minimum of 25Gb free space when project is imported and edited and this goes for
4x3 SD Video. For 16x9 HD my guess would be about 5 times more at least.
Neither Mac OS, iMovie or iDVD can address any other hard disk than the boot drive for it’s
scratch files. (Unlike Final Cut Express/Pro where You select scratch disk/s)
6. Network storage - DOESN’T WORK
Yours Bengt W

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