Table 7-1 POST numeric codes and text messages (continued)
Control panel message Description Recommended action
Invalid Electronic Serial Number Electronic serial number is missing. Enter the correct serial number in Computer
Setup.
Network Server Mode Active and No
Keyboard Attached
Keyboard failure while Network Server
Mode enabled.
1. Reconnect keyboard with computer
turned o.
2. Check connector for bent or missing
pins.
3. Be sure that none of the keys are
depressed.
4. Replace keyboard.
Parity Check 2 Parity RAM failure. Run Computer Setup and Diagnostic
utilities.
Interpreting POST diagnostic front panel lights and audible codes
This section identies the front panel light codes as well as the audible codes that can occur before or during
POST that might not have an error code or text message associated with them.
CAUTION: 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 AC outlet and allow the internal system components to cool before touching.
NOTE: If you see blinking lights on a PS/2 keyboard, look for blinking lights on the front panel of the computer
and see the following table to determine the front panel light 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.
Table 7-2 Interpreting POST diagnostic front panel lights and audible codes
Activity Beeps Possible cause Recommended action
White power light on. None Computer on. None
White power light blinks every
two seconds.
None Computer in Suspend to RAM
mode (some models only) or
normal Suspend mode.
None required. Press any key or move the mouse to
wake the computer.
Red power light blinks two times,
once every second, followed by a
two-second pause. Beeps stop
after fth iteration, but lights
continue until problem is solved.
2 Processor thermal
protection activated:
A fan might be blocked or
not turning.
OR
The heat sink and fan
assembly is not properly
attached to the processor.
1. Be sure that the computer air vents are not
blocked and that the cooling fan is running.
2. Open hood, press power button, and see if the
fan spins. If the processor fan is not spinning, be
sure the fan's cable is plugged onto the system
board header.
3. If fan is plugged in but is not spinning, then
replace fan.
4. Contact an authorized reseller or service
provider.
ENWW Interpreting POST diagnostic front panel lights and audible codes 95
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