- Apple iMac Retina 4K (21.5-inch, 2017) - 3 GHz Quad-Core Intel Core i5 processor - 32GB RAM - Radeon Pro 555 2GB Graphics - macOS Ventura 13.7.6 Sometimes the computer suddenly switch off and the you can't on it for few min. Not sure what's the problem, maybe simple cleaning will do.. Other than this runs very well and screen has no problems. No box, no keyboard, no mouse