User Guide

Mac Pro Troubleshooting — Symptom Charts 160
Reseat front panel board 2.
Replace front panel board 3.
Replace logic board 4.
Audio IO (rear audio line in; rear audio line out)
Start up the computer from a known-good volume (such as its Installation disc or an external 1.
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.
Check Sound settings in System Preferences 2.
Replace logic board 3.