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3-2 Dell OptiPlex GX
pro
Systems Service Manual
1-3-1 Main-memory refresh verifi-
cation failure
Faulty or improperly seated
DIMMs or defective system
board
1-3-3
1-3-4
1-4-1
1-4-2
2-1-1
through
2-4-4
Chip or data line failure in the
first 64 KB of main memory
Odd/even logic failure in the
first 64 KB of main memory
Address line failure in the
first 64 KB of main memory
Parity failure in the first
64 KB of main memory
Bit failure in the first 64 KB
of main memory
Faulty or improperly seated
DIMMs
3-1-1
3-1-2
3-1-3
3-1-4
Slave DMA-register failure
Master DMA-register failure
Master interrupt-mask regis-
ter failure
Slave interrupt-mask register
failure
Defective system board
3-2-4 Keyboard-controller test fail-
ure
Faulty keyboard controller
(defective system board)
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
Table 3-1. POST Beep Codes
(continued)
Beep Code Error Probable Causes