Blink Codes and Beep Codes for Intel® NUC

Last Reviewed: 13-Sep-2017
Article ID: 000005854

The power LED on the Intel® NUC blinks in a pattern if an error occurs during POST. Intel NUCs that include a front panel audio jack produce an audible beep pattern that you can hear through headphones, or speakers plugged into that jack.

Patterns and solutions

Sequence/pattern Meaning Troubleshooting steps

3 blinks (3 beeps)

On-off (1.0 second each) three times, then 2.5-second pause (off).

The pattern repeats until the computer is powered off.

Memory error

Make sure you are using the correct voltage memory for your Intel NUC.

Other tips:

  • Remove and reseat the memory.
  • Make sure the contacts on the memory and the socket are clean.
  • Check for a faulty memory module by trying the memory in a known good system.

If the Intel NUC has two memory slots:

  • Try using just one memory module at a time, swapping it between the upper and lower memory slots.
  • Try using memory modules from the same manufacturer with the same part number and speed.

Continual blinks

Off when the update starts, then on for 0.5 seconds, then off for 0.5 seconds.

The pattern repeats until the BIOS update is complete.

BIOS update in progress This pattern is normal behavior. No action is necessary.

2 blinks (2 beeps)

On-off (1.0 second each) two times, then 2.5-second pause (off).

The pattern repeats until the computer is powered off.

Video error (when no VGA option ROM is found)

This error is disabled by default in BIOS

2 red blinks

Repeating pattern: on 2.0 seconds, then off 2.0 seconds.
Computer is in Sleep mode (S3 state). This is normal operation. This blink pattern can be turned off in BIOS:
  1. Press F2 during boot to enter BIOS Setup.
  2. Go to Advanced > Power.
  3. In the Secondary Power Settings pane, set S3 State Indicator (or S3 Indicator Brightness) to OFF
  4. Press F10 to save and exit BIOS Setup.
1 blink every 5 seconds Power-on circuit may have failed Contact Intel Customer Support for assistance.

16 on/off blinks (8 beeps)

.25 seconds on, .25 seconds off, .25 seconds on, .25 seconds off, for a total of 16 blinks.

Then the computer shuts down.

CPU thermal trip warning

Check that chassis ventilation holes are not blocked and unit has sufficient airflow.

Still need help? Contact Intel Customer Support.

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