Compaq AP500 Reference Guide - Page 122
Run Computer Setup or, System Unit Error
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D-3 POST Error Messages and Codes Continued Error Code Probable Source of Problem 212-Failed Processor Failed processor (X is 0 or 1) 301-Keyboard Error Keyboard failure 303-Keyboard Controller Error 304-Keyboard or System Unit Error 40X-Parallel Port X Address Assignment Conflict 402-Monochrome Adapter Failure 404-Parallel Port Address Conflict Detected 501-Display Adapter Failure I/O keyboard controller Keyboard Both external and internal ports are assigned to parallel port X. Monochrome display controller Both external and internal ports are assigned to parallel port X. Graphics display controller Action Contact your Compaq authorized service provider. Check that you do not have a key stuck or something on the keyboard. Ensure that the keyboard is plugged in. Replace the keyboard if necessary. Contact your Compaq authorized service provider. Contact your Compaq authorized service provider. Run Computer Setup or Windows NT Workstation utilities. Replace the monochrome display controller. Run Computer Setup or Windows NT Workstation utilities. Replace the graphics display controller. Continued Compaq Professional Workstation AP500 Reference Guide