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February 4th, 2025 16:08
Optiplex 7480 AIO Orange Light Blinking Codes 3-1
OptiPlex 7480 All-In-One
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
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February 4th, 2025 18:06
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
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February 4th, 2025 22:37
@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
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February 5th, 2025 01:05
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
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February 5th, 2025 02:24
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
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February 5th, 2025 11:33
@Chino de Oro Thank you. We'll do that.
Quetzal013
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February 5th, 2025 11:34
@redxps630 Thanks for your help. We'll get a brand new battery and try that.