Did not work
l did all of these steps but right now l even can't download file.l try to open the download file and it opens and closes immediately.
MacBook Pro 13″, macOS 10.13
Question marked as
Try this...
Safe Boot, (holding Shift key down at startup), does the problem occur in Safe Mode? Could take 10 minutes.
Safe mode attempts to repair Disks & clears lots of caches & loads safe Drivers, & prevents loading of 3rd party extensions, so if Safe Mode works try again in regular boot.