Other Failures Optical drive

  1. Try different optical media.
  2. If two drives are installed, check the Master/Slave or Cable Select jumpers on both optical drives (this will depend on drive vendor). Both drives should be set to 'Cable Select' mode for proper operation.
  3. If two drives are installed, test one optical drive at a time by disconnecting one of the drives to see if the other one works.
  4. Replace optical drive cable
  5. Replace optical drive
  6. Replace logic board

Front Panel FireWire port

  1. Reset SMC.
  2. Reseat front panel board cables
  3. Replace front panel board cables
  4. Reseat front panel board
  5. Replace front panel board
  6. Replace logic board

Rear FireWire port

  1. Reset SMC.
  2. Replace logic board

Front Panel USB 2.0 port

  1. Reseat front panel board cables
  2. Replace front panel board cables
  3. Reseat front panel board
  4. Replace front panel board
  5. Replace logic board

Rear Panel USB 2.0 port

Replace logic board

Internal speaker

  1. The Mac Pro (Early 2008) should emit a startup chime through its internal speaker, regardless of whether headphones or external speakers are connected. If you hear a normal startup chime, but no other audio is produced from the internal speaker, and there is nothing connected to either audio-out port, suspect a damaged front panel headphone port or rear audio-out port. In this case, replace the front panel board or logic board as necessary. If you do not hear a startup chime through the internal speaker, even after resetting PRAM, follow the steps below.
  2. Check the sound output settings in the Sound preferences to ensure the internal speaker is selected.
  3. Check speaker cable connection
  4. Replace speaker
  5. Replace logic board

Audio IO (front headphones)

  1. Start up the computer from a known-good volume (such as its Installation disc or an external hard drive), to isolate the issue to software or hardware. If the computer seems to perform adequately when booted in this way, troubleshoot as a software issue. If the computer continues to exhibit the issue, follow the steps below.
  2. Reset PRAM
  3. Reseat front panel board
  4. Replace front panel board
  5. Replace logic board

Audio IO (rear audio line in; rear audio line out)

Note: A red light shines from the rear optical audio-out connector, whether or not a device is connected to it. This is a normal condition.

  1. Start up the computer from a known-good volume (such as its Installation disc or an external hard drive), to isolate the issue to software or hardware. If the computer seems to perform adequately when booted in this way, troubleshoot as a software issue. If the computer continues to exhibit the issue, follow the steps below.
  2. Check Sound settings in System Preferences
  3. Reset PRAM
  4. Replace logic board

• Service Source

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