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3-10
Diagnostic Tools
POST Error Messages
Continued
Error Code
Audible
Beeps
L=Long
S=Short
Probable Source of
Problem
Action
ZZ
-301-
Keyboard Error
None
Keyboard failure. (
ZZ
represents the
Keyboard Scan
Code.)
1. A key is stuck. Try to
free it.
2. Replace the
keyboard.
303-Keyboard
Controller Error
None
System board,
keyboard, or mouse
controller failure.
1. Run Diagnostics.
2. Replace failed
assembly as
indicated.
304-Keyboard
or System Unit
Error
None
Keyboard, keyboard
cable, or system
board failure.
1. Make sure the
keyboard is
attached.
2. Run Diagnostics to
determine which is in
error.
3. Replace the part
indicated.
40X-Parallel
Port X Address
Assignment
Conflict
2S
Both external and
internal ports are
assigned to parallel
port X.
Run the System
Configuration Utility and
correct.
402-
Monochrome
Adapter
Failure
1L, 2S
Monochrome display
controller.
Replace the
monochrome display
controller.
501-Display
Adapter
Failure
1L, 2S
Video display
controller.
Replace the video
board.
601-Diskette
Controller Error
None
Diskette controller
circuitry failure.
1. Make sure the
diskette drive cables
are attached.
2. Replace the diskette
drive and/or cable.
3. Replace the system
board.
605-Diskette
Drive
Type Error
2S
Mismatch in drive
type.
Run the System
Configuration Utility to
set diskette type
correctly.