Dell OptiPlex Gs Service Manual (.pdf) - Page 47
Faulty I/O chip defective, Gate A20 failure
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Table 3-1. POST Beep Codes (Continued) Beep Code Error Probable Causes 3-3-4 3-4-1 Screen initialization failure Screen-retrace test failure Faulty video subsystem (defective system board) 3-4-2 4-2-1 Search for video ROM failed No timer tick Defective system board 4-2-2 Shutdown failure 4-2-3 Gate A20 failure 4-2-4 4-3-1 4-3-3 4-3-4 4-4-1 4-4-2 4-4-3 4-4-4 Unexpected interrupt in protected mode Memory failure above address 0FFFFh Timer-chip counter 2 failure Time-of-day clock stopped Serial-port test failure Parallel-port test failure Math coprocessor failure Cache test failure Faulty or improperly seated SIMM Defective system board Bad battery or defective system board Faulty I/O chip (defective system board) Faulty I/O chip (defective system board) Faulty microprocessor chip or system board Defective microprocessor or system board Beep Codes and Error Messages 3-3