A folder with a question mark, a crossed circle, or it hangs on the Apple logo.
A damaged system, drive or failed update.
macOS Recovery, disk repair and a reinstall that keeps your files when possible.
It depends on the model and on what we find inside, so we quote each repair individually. The diagnosis fee depends on the device, and you approve the exact repair price before any repair starts. If it can't be fixed, you only pay the diagnosis.