Table 9-2 Diagnostic Front Panel LEDs and Audible Codes (continued)
Activity | Beeps | Possible Cause | Recommended Action | |
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|
|
|
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Red Power LED flashes two | 2 | Processor thermal | 1. | Ensure that the computer air vents are not |
times, once every second, |
| protection activated: |
| blocked and the processor cooling fan is |
followed by a two second |
| A fan may be blocked or |
| running. |
pause. Beeps stop after fifth |
| 2. |
| |
iteration but LEDs continue |
| not turning. | Open hood, press power button, and see if | |
until problem is solved. |
| OR |
| the processor fan spins. If the processor fan |
|
|
| is not spinning, make sure the fan's cable is | |
|
| The heat sink/fan |
| plugged onto the system board header. |
|
|
|
| |
|
| assembly is not properly | 3. | If fan is plugged in, but is not spinning, then |
|
| attached to the processor. |
| replace heat sink/fan assembly. |
|
|
| 4. | Contact an authorized reseller or service |
|
|
|
| provider. |
|
|
|
|
|
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 iteration but LEDs continue until problem is solved.
Red Power LED flashes four | 4 | Power failure (power |
times, once every second, |
| supply is overloaded). |
followed by a two second |
| OR |
pause. Beeps stop after fifth |
| |
iteration but LEDs continue |
| The incorrect external |
until problem is solved. |
| |
|
| power supply adapter is |
being used on the USDT.
1.Open the hood and ensure the 4 or
2.Check if a device is causing the problem by removing ALL attached devices (such as hard, diskette, or optical drives, and expansion cards). Power on the system. If the system enters the POST, then power off and replace one device at a time and repeat this procedure until failure occurs. Replace the device that is causing the failure. Continue adding devices one at a time to ensure all devices are functioning properly.
3.Replace the power supply.
4.Replace the system board.
OR
The USDT power supply adapter must be at 135W and use the Smart ID technology before the system will power up. Replace the power supply adapter with the
Interpreting POST Diagnostic Front Panel LEDs and Audible Codes 187
