LED Blink Codes for Intel® Desktop Boards

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

The pattern repeats once.

Then the computer continues to boot.

• Reseat add-in graphics card.
• Make sure a compatible processor is installed.
• For more troubleshooting steps, see:
  • No video and two beeps during boot
  • Intel® Processors and Boards Compatibility Tool

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

The pattern repeats until the computer is powered off.

• 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.

• Check that the processor heat sink/fan is properly installed.
• Check that the thermal interface material is sufficient and is spread evenly.

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.