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Activity | Beeps | Possible Cause | Recommended Action | |
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Red Power LED flashes two | 2 | Thermal protection | 1. | Clean the air vents on the front, back, or |
times, once every second, |
| activated: |
| any other vented side of the computer. |
followed by a two second |
| Air flow is restricted, a fan | 2. | Ensure that there is a 10.2 cm (4 in) |
pause. Beeps stop after fifth |
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iteration but LEDs continue |
| may not be functioning, or |
| clearance on all vented sides of the |
until problem is solved. |
| the heatsink is not |
| computer to permit the required airflow. |
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| properly attached. | 3. | Ensure that computers are not so near |
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| each other that they are subject to each |
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| other's |
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| 4. | If the computer is within an enclosure, |
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| ensure that there is proper intake and |
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| exhaust ventilation for the enclosure. |
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| 5. | If a message appears on the screen |
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| indicating that a fan is not working, replace |
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| the fan. |
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| 6. | Ensure that the heat sink is properly |
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| attached. |
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Red Power LED flashes three | 3 | Processor not installed | 1. | Check to see that the processor is present. |
times, once every second, |
| (not an indicator of bad | 2. | Reseat the processor. |
followed by a two second |
| processor). | ||
pause. Beeps stop after fifth |
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iteration but LEDs continue |
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until problem is solved. |
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Red Power LED flashes four | 4 | Power failure (power | 1. | Open the hood and ensure the 4 or |
times, once every second, |
| supply is overloaded). |
| power supply cable is seated into the |
followed by a two second |
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| connector on the system board. |
pause. Beeps stop after fifth |
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| 2. | Check if a device is causing the problem by |
iteration but LEDs continue |
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until problem is solved. |
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| removing ALL attached devices (such as |
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| hard, diskette, or optical drives, and |
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| expansion cards). Power on the system. If |
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| the system enters the POST, then power off |
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| and replace one device at a time and |
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| repeat this procedure until failure occurs. |
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| Replace the device that is causing the |
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| failure. Continue adding devices one at a |
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| time to ensure all devices are functioning |
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| properly. |
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| 3. | Replace the power supply. |
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| 4. | Replace the system board. |
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Red Power LED flashes five | 5 | CAUTION: To avoid damage to the DIMMs or | ||
times, once every second, |
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| the system board, you must unplug the computer | |
followed by a two second |
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| power cord before attempting to reseat, install, or | |
pause. Beeps stop after fifth |
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| remove a DIMM module. | |
iteration but LEDs continue |
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| 1. | Reseat DIMMs. |
until problem is solved. |
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| 2. | Replace DIMMs one at a time to isolate the |
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| faulty module. |
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| 3. | Replace |
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| memory. |
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| 4. | Replace the system board. |
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