The first step is to reset SMC. If that doesn't resolve it, you'll probably have to bring it in for service. I don't know if replacing the internal battery is indicated, but it's worth considering.


Jon

macOS 11.7.10, iMac Retina 5K 27-inch, late 2014, 3.5 GHz Intel Core i5, 1 TB fusion drive, 16 GB RAM, Epson SureColor P600, Photoshop CC, Lightroom CC, MS Office 365