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Power LED Diagnostics
The power button LED located on the front of the chassis also functions as a bicolored diagnostic LED. The diagnostic LED is only active
and visible during the POST process. Once the operating system starts to load, it is no longer visible.
Amber LED blinking scheme – The pattern is 2 or 3 blinks followed by a short pause then x number of blinks up to 7. The repeated pattern
has a long pause inserted in the middle. For example 2,3 = 2 amber blinks, short pause, 3 amber blinks followed by long pause then
repeats.
Table 14. Power LED Diagnostics
Amber LED State
off
off
blinking
steady
off
Amber LED
Description
State
2,1
system board failure
2,2
system board, PSU or PSU cabling failure
2,3
system board, memory or CPU failure
2, 4
coin-cell battery failure
2,5
corrupt BIOS
2,6
CPU configuration failure or CPU failure
2,7
memory modules are detected, but a memory failure
3,1
possible peripheral card or system board failure
3,2
possible USB failure
3,3
no memory modules are detected
3,4
possible system board error
3,5
memory modules are detected, but a memory configuration or compatibility error
3,6
possible system board resource and/or hardware failure
3,7
some other failure with messages on screen
Beep Code
The computer can emit a series of beeps during start-up if the display does not show errors or problems. These series of beeps, called
beep codes, identify various problems. The delay between each beep is 300 ms, the delay between each set of beeps is 3 sec, and the
beep sound lasts 300 ms. After each beep and each set of beeps, the BIOS should detect if the user presses the power button. If so, BIOS
will jump out from looping and execute the normal shutdown process and power system.
Code
1-3-2
42
Troubleshooting your computer
Troubleshooting your computer
White LED State
off
breathing
off
off
steady
Description
system is OFF
system is in sleep state
power supply unit (PSU) failure
PSU is working but failed to fetch code
system is ON
5