Optiplex 7480 AIO Orange Light Blinking Codes 3-1

Question

Hello everyone,

My husband’s Dell Optiplex 7480 AIO has an amber flashing power button (3 amber flashes, then 1 white flash, followed by a long pause) which started today. After researching on Dell website we discovered it meant a failing CMOS battery.

We’ve changed the battery but still got the same issue with the power button flashing – 3 amber flashes, then 1 white flash and a long pause. The battery is well within use-by date and stored in a cool, dark cupboard.

Has anyone got any suggestions?

Many thanks,

Carol

redxps630 · Answer

try a RTC reset

OptiPlex 24-7480 All-in-One mentioned here

"Dell Inspiron, OptiPlex, Dell Precision, XPS, and Vostro Desktop computers equipped with RTC reset"

How to Reset the Real-Time Clock (RTC) to Recover Your Dell Desktop System | Dell US

Quetzal013 · Answer

@redxps630​ Thanks for that. But, we tried the RCT reset and still got the same problem. Yet, all hardware tests come back as having no problems.

Chino de Oro · Answer

Test with multimeter to see if it could be a faulty replacement battery. And replace again with a fresh, new CR2032.

https://www.dell.com/support/manuals/en-us/optiplex-7480-aio/7480aio_servicemanual/installing-the-coin-cell-battery?guid=guid-cd81f560-3e07-42b6-a65a-aadb43cbe033&lang=en-us

redxps630 · Answer

Re: The battery is well within use-by date and stored in a cool, dark cupboard. agree w chino, to be sure, buy a new CR2032 from grocery store to test.

Quetzal013 · Answer

@Chino de Oro​ Thank you. We'll do that.

Quetzal013 · Answer

@redxps630​ Thanks for your help. We'll get a brand new battery and try that.

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Optiplex 7480 AIO Orange Light Blinking Codes 3-1

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