optiplex 3090 blinking power led

Question

My Optiplex 3090 has a 1 white, pause, 3 amber flash repeating sequence.  It has spontaneously powered off twice in the past month.  I did a hard reset (hold in power button with power cord removed for 20 secs), and ran quick diagnostics and all is well per the results page, but the blinking persists.

Chino de Oro · Accepted Answer

Replace your system CMOS battery with a new one. Refer to instructions on service manual and taking precaution while working on motherboard and components.

https://www.dell.com/support/manuals/en-ly/optiplex-3090-desktop/optiplex3090_mt_sm/removing-the-coin-cell-battery?guid=guid-7ceea456-458c-490a-b753-5d0f1cb2f257&lang=en-us

redxps630 · Answer

3, 1

three blinks followed by a short pause, one blink, long pause, then repeats.

RTC Power Failure CMOS Battery Failure

If you can troubleshoot, narrow down the issue by swapping a known good CMOS battery, if available.

if this is the LED code, chino is correct

DelawareNative · Answer

@Chino de Oro​ , this worked perfectly.  Thanks.

Optiplex Desktops

optiplex 3090 blinking power led

Was this post helpful?