When my computer boots or restarts, I see ghosts!
Without seeing a photo or video of the phenomenon you're describing, two possibilities come to mind:
- You may be seeing LCD image persistence, or "burn in", which is a parasitic behavior in liquid crystal displays that can occur when a static image, particularly at high brightness levels, remains on the screen for an extended period of time. Older displays are more likely to experience this. For example:
- You might be seeing the unhibernation process taking place. In order to enter hibernation, macOS writes all contents of memory onto disk before shutting off power to almost every part of the computer. In order to wake from hibernation, the prior memory contents have to be restored from disk, which takes time. To show the user that the machine is working, system firmware draws a progress bar along with a grayscale image of the screen as it looked before entering sleep. It looks like this:
So does your Mac look like either of those? Can you show us a photo or video?