Compaq ProLiant 4500 ProLiant Server Troubleshooting Guide - Page 205
Series POST Error Messages, the Keyboard Scan
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POST Error Messages 300 Series POST Error Messages Table C-5: 300 Series POST Error Messages Error Code 301-Keyboard Error Audible Beeps None Probable Source of Problem Keyboard failure occurred. 301-Keyboard Error or Test Fixture Installed None Keyboard failure occurred. ZZ-301-Keyboard Error None 303-Keyboard Controller Error None Keyboard failure occurred. (ZZ represents the Keyboard Scan Code.) System board, keyboard, or mouse controller failure occurred. Action 1. Turn off the computer, and then reconnect the keyboard. 2. Be sure that no keys are depressed or stuck. 3. If this does not solve the problem, replace the keyboard. 1. Turn off the computer, and then reconnect the keyboard. 2. Be sure that no keys are depressed or stuck. 3. If this does not solve the problem, replace the keyboard. 1. Be sure that no keys are depressed or stuck. 2. If this does not solve the problem, replace the keyboard. Run Diagnostics. Replace failed assembly as indicated. continued HP Servers Troubleshooting Guide C-25