Table
Control panel message | Description | Recommended action |
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Invalid Electronic Serial Number | Electronic serial number is missing. | Enter the correct serial number in Computer |
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| Setup. |
Network Server Mode Active and No | Keyboard failure while Network Server |
Keyboard Attached | Mode enabled. |
1.Reconnect keyboard with computer turned off.
2.Check connector for bent or missing pins.
3.Ensure that none of the keys are depressed.
4. Replace keyboard.
Parity Check 2 | Parity RAM failure. | Run Computer Setup and Diagnostic utilities. |
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Interpreting POST Diagnostic Front Panel LEDs and Audible Codes
During the system validation phase, the BIOS will validate the functionality of the CPU, memory, graphics, system board and all other platform components. Since the display may not be functional, the power button LED and the speaker will be used to indicate an error. The speaker will be used so that a support agent can detect the error code over the phone. The pattern of the blink/beep error indicator will be 1 blink/beep per second followed by a 2 second pause at the end of the sequence. The sequence will repeat for 5 cycles. After the 5 cycles are complete, only the blink will continue.
WARNING! When the computer is plugged into an AC power source, voltage is always applied to the system board. To reduce the risk of personal injury from electrical shock and/or hot surfaces, be sure to disconnect the power cord from the wall outlet and allow the internal system components to cool before touching.
Test | Failure | Power | Speaker |
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| button LED |
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CPU | CPU not functional | 1 blink | 1 beep |
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BIOS | BIOS corruption | 2 blinks | 2 beeps |
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Memory | Module error | 3 blinks | 3 beeps |
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Graphics | No controller | 4 blinks | 4 beeps |
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System board | Other failure | 5 blinks | 5 beeps |
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BIOS | Authentication failure, if supported | 6 blinks | 6 beeps |
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Interpreting POST Diagnostic Front Panel LEDs and Audible Codes | 73 |