Let's just say it's a story of unknown Bluetooth interference or a paired Bluetooth device that’s in range of the Mac. Show I had this very issue last week on my Early 2013 15' MacBook Pro with Retina Display. Normal (Left) mouse-click wouldn't work under any conditions while running OS X, the built-in Trackpad, Magic Mouse or USB Mouse, while the secondary-click was fine on all. I booted my MBP with a Linux Mint Live USB Flash Drive and the built-in Trackpad, Magic Mouse and USB Mouse all worked, both normal-click and secondary-click. So at least I knew the built-in Trackpad, Magic Mouse and USB Mouse hardware was fine and it was looking like a software issue. As another trouble shooting process I made an OS X USB Flash Drive Installer, figuring it would boot clean and the built-in Trackpad or Magic Mouse would work fine since it worked under Linux, however during the install... no normal-click would work, while the secondary-click was fine. Turns out my Magic Trackpad, which I was not using and was in the closet, was depressed by a book that fell over on to it. Because it was connected, even though not in use, it was causing the other clickable devices to fail on the normal-click while the secondary-click still worked. This drove me crazy for a couple of hours because the book fell when I was not in the room, so I never heard it or suspected the Magic Trackpad to be an issue. Linux Mint Live USB Flash Drive worked because the Magic Trackpad was not paired to it and therefore couldn't and didn't interfere. Unlike in OS X it automatically connected. What a pain it was but who doesn't love a good mystery! Do you by chance have a Magic Trackpad lying around? —— Or a Bluetooth mouse in a travel bag - if that mouse is pressed down, you can’t ever get a left mouse up event from any other device. In this articleHow to enable Mouse Keys to control the mouse pointer using your keyboard How to enable Mouse Keys to control the mouse pointer using your keyboard
Using Mouse KeysWhen Mouse Keys is on, you can move the mouse pointer by holding down certain keys on the keyboard or on the numeric keypad (if you have one). To move the mouse pointer: To perform a left click: Press and hold the mouse button: To
release the mouse button: To perform alternative pointer actions (see step 8, above, to see how to assign different keys to perform these actions): Left click: F11 Note: If this does not work it could be because someone else manages your computer settings (an IT department or administrator). If this is the case, you will need to contact them to access these settings or for further help. How do you left click on a Macbook Pro without a mouse?Use your keyboard like a mouse
Choose Apple menu > System Preferences, then click Keyboard. Click Shortcuts. From the bottom of the preferences window, select the checkbox “Use keyboard navigation to move focus between controls.” (In macOS Mojave or earlier, this setting appears as an “All controls” button.)
How do you right and left click on a Macbook Pro?Open System Preferences (either by clicking on the cog icon if it is in your Dock, or by clicking on the Apple icon at the top left of your screen and then System Preferences.) Select Mouse. Click Point & Click. Beside secondary click choose Click on right side (or left side).
How do you left click on a Mac keyboard?By default, the keys assigned to pointer actions are: Left click: F11. Right click: F12. Double click: unassigned.
How do you left click on a touchpad?To click, tap on the touchpad. To double-click, tap twice.
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