62IntroductionThis chapter contains the check procedures used to diagnosethe causes of product failures. The diagnostic informationconsists of:Start: This is the starting point for any diagnostic action.Based on high-level symptoms, the check procedure directs youto more detailed procedures to help resolve machine failures.Index of Symptoms, Messages, Error Codes, or Beeps: Thetables for BIOS Error Messages, Codes, Beeps, and ErrorSymptoms list symptoms along with their probable causes, anddirect you to the applicable check procedures to help resolvemachine failures. These tables also list the field replaceableunits (FRUs) most likely to cause a particular problem.Check Procedures: When the Start check procedure or theIndex of Symptoms, Messages, Error Codes, or Beeps tablespoint you to a specific check procedure, proceed to that section.If there are any notes or instructions at the top of the page, readthem before you begin with the procedure. Carefully read eachstep of the check procedure and perform the steps as instructed.If you do not remember the location of a specific part or testpoint, or an adjustment or removal procedure, see the chapterthat contains that information. Always return to the checkprocedure after you do this. In some cases, you are referred toother check procedures to detect the cause of the failure.
