Having trouble after installing High Sierra? Here’s how to tackle some of the most common issues
Skim some online discussion forums and you’d be forgiven for thinking High Sierra breaks pretty much everything. Some people report that their Mail, Contacts, or Messages are lost or not synced. Apps stop working. Wi-Fi or Bluetooth fall over.
There do seem to be bugs that Apple has still to fix. Certain fonts — even key ones such as Times — might stop showing up in Apple apps. Apps might not play videos that are over 1GB in size from an external drive without a tedious process of “verifying,” which can take several minutes. But most glitches, it seems, can be cured with a little tweaking…
If your Mac won’t start
Start up in safe mode (see bit.ly/macsafemd), which performs some basic housekeeping, cleans out some caches, and disables unnecessary extensions, fonts, and startup items, all of which could be the cause of the issue. If your Mac works in this mode, restart in its normal mode to see if the problem is gone there, too.
Other sleep or power iss ues
If your MacBook won’t wake or sleep, the fan is racing when there’s no intensive activity underway, its battery isn’t charging, or USB devices aren’t being recognized, resetting the SMC (System Management Controller) might help. But, Apple provides a list of scenarios in which this may be necessary — see bit.ly/mfresetsmc.
Settings won’t stick
If system settings such as sound volume, display resolution, and time zone won’t stay the way you set them, reset the NVRAM (non-volatile random access memory) — hold down Alt+Cmd+P+R at startup and release when you hear the startup sound a second time, or see the Apple logo. Further details about NVRAM are at bit.ly/mfresetnvram.
Roll bac k to Sierra
Apple recommends High Sierra to ensure you get the latest security and compatibility enhancements. But it is still possible to download and install Sierra (on Macs released prior to High Sierra); use this option if you don’t have a Time Machine backup from when you ran Sierra that you can roll back to. You’ll find a link at bit.ly/get-sierra.