Apple's Mac sales have dropped by 17.5% year-on-year, putting pressure on the upcoming M4-powered MacBooks.Global PC shipments have grown by 1.3% in Q3 2024, while Mac shipments declined from 6.2 million to 5.1 million units.Possible reasons for the drop in Mac sales include the high cost of Macs, economic uncertainty, and the post-pandemic slowdown in device sales.Customers might be waiting for Apple's upcoming releases, such as the new Mac mini and next-gen M4-powered Macs.