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Beep Codes and Error Messages 3-3
3-3-4
3-4-1
3-4-2
Screen initialization failure
Screen-retrace test failure
Search for video ROM failure
Faulty video subsystem
(defective video expansion
card)
4-2-1
4-2-2
4-2-3
4-2-4
No timer tick
Shutdown failure
Gate A20 failure
Unexpected interrupt in pro-
tected mode
Defective system board
4-3-1 Memory failure above
address 0FFFFh
Faulty or improperly seated
DIMMs
4-3-3 Timer-chip counter 2 failure Defective system board
4-3-4 Time-of-day clock stopped Bad battery or defective sys-
tem board
4-4-1 Serial/parallel port test failure Faulty I/O chip (defective sys-
tem board)