Mac os x boot caches updating
Inevitably, when there's a new release of an operating system there are going to be problems, but don't let the list below put you off, as most people should find the process of upgrading to mac OS Sierra pretty painless.If you haven't upgraded already, check out our guide How to download mac OS Sierra.
It might also be worth switching from a Wi-Fi connection to a wired connection before you download and install.
To force-quit an item, click it in the Activity Monitor list, then click the X at the left of the toolbar, then confirm you want to force-quit. Open the Finder window, select 'Go' from the top menu and select 'Go to Folder'.
In the text box that appears type /Library/Caches Remove the data from inside every folder.
Release the keys after you hear the second startup chime. For other ways to fix a Mac that won't start, check out our guides How to Use OS X boot options to troubleshoot your Mac and How to fix a Mac that won't start.
If your Mac is running noticeably slower after upgrading, there are a number of things you can try to speed up mac OS Sierra.