Check the headphone jack for issues. Dust or fluff is enough to block the port from recognizing your headphones or speakers. Try blowing the dust off the jack and from inside the port on your Mac to see if that solves the problem. Plug the headphones back in while holding the volume buttons at the same time.
Go to Apple menu > Restart. Ensure that your Mac is updated to the latest version of macOS. Go to System Preferences > Software Update. If restarting does not work, restart your Mac in Safe Mode.
Check your keyboard settings: On your Mac, go to System Preferences > Keyboard > Keyboard tab. Check to see if the “use F1, F2, etc. keys standard function keys” box is checked. If it is, uncheck it, and then try to adjust your brightness again.
There's something wrong with the cable. There's a power supply problem. Your drive has been corrupted or broken. The drive is not readable on macOS.
If your Mac has OS X 10.10 Yosemite or earlier, you may have to install Silverlight on your Mac. This is because your system may not support Netflix's HTML5 player. You will be asked to install Silverlight when you open Netflix and select a show or movie to play. A Silverlight popup will appear.
Solution: Try a hard restart: Do this if the laptop appears to be working but the screen won't turn on. Hold down the Power button for at least 10 seconds. Push the Power button again to see if the screen turns on.
Here then are the most common ways to fix Netflix streaming problems on a Mac.
Defective AC plug If the light on your charger doesn't come on, then the reason your MacBook won't turn on or charge could be a defective plug. All MacBook chargers come with removable plugs, so you can use one from another charger or an Apple power adapter extension cable to see if that's the cause.
Press these three keys together: Option, CommandCommandThe Command key, ⌘, formerly also known as the Apple key or open Apple key, is a modifier key present on Apple keyboards. The Command key's purpose is to allow the user to enter keyboard commands in applications and in the system., and Esc (EscapeEsc (EscapeOn computer keyboards, the Esc key Esc (named Escape key in the international standard series ISO/IEC 9995) is a key used to generate the escape character (which can be represented as ASCII code 27 in decimal, Unicode U+001B, or Ctrl + [ ).). Or choose Force Quit from the Apple menu in the upper-left corner of your screen. (This is similar to pressing Control-Alt-Delete on a PC.)
If macOS 10.14 updates are not appearing in the App Store, some preference settings may prevent it from doing so. Open System Preference and select the App Store, and then turn on the automatic updates check function for all the options. Click "Check Now" to see if the problem has been resolved.
If you have a Mac computer and experience issues playing content on the Safari browser, this is due to a Safari feature which blocks the autoplay function on video playback. To enable autoplay, simply follow these steps: Click Safari, then 'Settings for this website'
First, you need to make sure your device is enrolled in Messages. Your device needs to be enrolled in Messages in order to receive messages. This means you'll need to log in to your Apple ID on your Mac. You can check your login status in the “Accounts” tab of the Messages preference window.
Go to Check Compatibility to see if your mac qualifies for the OS upgrade you want. Then go to the Use Safari to download macOS section and click on the OS you want to install. Before upgrading make a full back up of your Mac. Check that third party apps you use have updates available for the new OS.