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