Read If a flashing question mark appears and follow the links for more suggestions. Probably, the "genius" did these things but it doesn't hurt to do them yourself.


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