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Blink codes and beep codes

The power LED on the Intel® NUC will blink in a pattern if an error occurs during POST. Intel NUC products that include a front panel audio jack will also produce an audible beep pattern, which can be heard through headphones or speakers plugged into that jack.

See the table for the patterns and solutions.

LED blink pattern Sequence/pattern Meaning Troubleshooting steps
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 needed.
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

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
  • Reseat the memory.
  • Make sure that the contacts on the memory and the socket are clean.
  • Try removing one bank of memory modules at a time. (Some systems can require a memory module in Bank 0.)
  • Try using memory modules from the same manufacturer with the same part number and speed.
  • Check for a faulty memory module by trying the memory in a known good system.
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 the processor heat sink/fan is properly installed.
  • Check that the thermal interface material is sufficient and is spread evenly.

This applies to:

IntelŽ NUC Board D33217CK
IntelŽ NUC Board D33217GKE
IntelŽ NUC Board D34010WYB
IntelŽ NUC Board D53427RKE
IntelŽ NUC Board D54250WYB
IntelŽ NUC Board DCP847SKE
IntelŽ NUC Board DE3815TYBE
IntelŽ NUC Kit D34010WYK
IntelŽ NUC Kit D54250WYK
IntelŽ NUC Kit DC3217BY
IntelŽ NUC Kit DC3217IYE
IntelŽ NUC Kit DC53427HYE
IntelŽ NUC Kit DE3815TYKHE
IntelŽ NUC Kit DN2820FYKH

Solution ID: CS-034364
Last Modified: 02-Jun-2014
Date Created: 04-Jun-2013