Visible blink patterns display via the front panel power LED.
|LED Blink Pattern||Sequence/Pattern||Meaning||Troubleshooting Steps|
On-off (1.0 second each) two times, then 2.5-second pause (off).
The pattern repeats once.
Then the computer continues to boot.
|Video error (no add-in graphics card installed)|
On-off (1.0 second each) three times, then 2.5-second pause (off).
The pattern repeats until the computer is powered off.
|16 on/off blinks||.25 seconds on, .25 seconds off, for a total of 16 blinks.
Then the computer shuts down.
|CPU thermal trip warning||
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 blink pattern is normal behavior. No action needed|