Control panel message | Description | Recommended action | |
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Network Server Mode Active and No Keyboard | Keyboard failure while Network Server Mode | 1. | Reconnect keyboard with computer |
Attached | enabled. |
| turned off. |
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| 2. | Check connector for bent or missing pins. |
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| 3. | Ensure that none of the keys are |
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| depressed. |
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| 4. | Replace keyboard. |
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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
This section covers the front panel LED codes as well as the audible codes that may occur before or during POST that do not necessarily have an error code or text message associated with them.
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.
NOTE: If you see flashing LEDs on a PS/2 keyboard, look for flashing LEDs on the front panel of the computer and refer to the following table to determine the front panel LED codes.
Recommended actions in the following table are listed in the order in which they should be performed. Not all diagnostic lights and audible codes are available on all models.
Activity | Beeps | Possible cause | Recommended action | |
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White Power LED On. | None | Computer on. | None |
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White Power LED flashes every | None | Computer in Suspend to | None required. Press any key or move the mouse to | |
two seconds. |
| RAM mode (some models | wake the computer. | |
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| only) or normal Suspend |
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| mode. |
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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 pause. |
| A fan may be blocked or not |
| running. |
Beeps stop after fifth iteration |
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| turning. | 2. Open hood, press power button, and see if the | ||
but LEDs continue until problem |
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| processor fan spins. If the processor fan is not | |
is solved. |
| OR |
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| spinning, make sure the fan's cable is plugged | ||
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| The heat sink/fan assembly |
| onto the system board header. |
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| is not properly attached to | 3. | If fan is plugged in, but is not spinning, then |
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| the processor. | ||
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| replace heat sink/fan assembly. | |
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| 4. | Contact an authorized reseller or service |
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| provider. |
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Red Power LED flashes four | 4 | Power failure (power supply | 1. Open the hood and ensure the 4 or | |
times, once every second, |
| is overloaded). |
| power supply cable is seated into the |
followed by a two second pause. |
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| connector on the system board. |
Beeps stop after fifth iteration |
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| 2. | Check if a device is causing the problem by |
but LEDs continue until problem |
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| ||
is solved. | removing ALL attached devices (such as hard, | |
diskette, or optical drives, and expansion | ||
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| 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 |
Interpreting POST diagnostic front panel LEDs and audible codes 205