如果kext驱动有问题，很有可能Command ⌘+R是进不了恢复模式的，需要Command ⌘+Option⌥+R网络的远程恢复模式
Booting up in recovery mode
rm -r /Volumes/Macintosh\ HD/System/Library/Extensions/360*.kext
and same in
/Library/Extensions /System/Library/Extensions /Library/StartupItems
How to Fix completely if El Capital freezes after installing?
- Firstly, you should force turn off the Mac then turn it on again using the power button to see what’s going on.
- If the problem remains the same, you should reinstall El Capitan. Get OS X Recovery boot by keep holding ⌘ and r after press the power button. And then you will be able to choose “Reinstall Mac OS X” option.
- At for the users who upgrade El Capitan over an existing OS X, removing all 3rd party Kexts (especially the one related to Eltima: ElmediaPlayer.kext and EltimaAsync.kext ) and extensions which are not belonged to Apple does work.
How to remove old kexts file left over using Terminal?
1. Booting up in recovery mode
2. Open the terminal window
3. Enter the following command line to see all available kext
ls /Volumes/Macintosh\ HD/System/Library/Extensions
4. Remove the kext that does not belong to Apple. Please be careful to what you do in this step.
How to remove a particular ThirdParty.kext using terminal? use the following command form:
rm -r /Volumes/Macintosh\ HD/System/Library/Extensions/ThirdParty.kext
Some common ThirdParty.kexts should be removed: ElmediaPlayer.kext, EltimaAsync.kext, VBox.kext,… This works on too many users.
Indeed, the key is removing any extraneous .kext files from:
A stuck progress bar usually occurs when your laptop attempts to reboot from an unexpected shutdown. Such a shutdown occurs due to one of three issues:
- A software fault causing the computer to reboot unexpectedly
- The power button is continually held down, forcing a shutdown
- An older battery quickly drains to 0% before the operating system has the opportunity to shut down gracefully
Try the following solutions below, in order, to resolve the problem.
Boot your Mac in Safe Mode. To load your Mac in Safe Mode, press and hold the Shift key while tapping the power button to start your computer. You can stop holding the Shift key when you see an Apple logo and progress bar. If your computer loads successfully, you will want to run disk maintenance on your startup disk:
- Click on Spotlight (top right of your desktop), type disk, click on Applications: Disk Utility
- In the left column of Disk Utility, select the Macintosh HD. If there is more than one item that says Macintosh HD, select the one in the picture below.
- Click on the Repair Disk Permissions button and let it run a check. This should take 1 to 5 minutes.
- Click on Verify Disk to run a scan, This should also take about 1 to 5 minutes.
- Once both Repair Disk Permissions and the Repair Disk tasks are complete, restart your computer normally without holding the Shift key: Click the Apple icon on the top left of your desktop, and choose Restart.
Boot your Mac in Recovery Mode. To load your Mac in Recovery Mode, press and hold the Command (⌘) and R keys while tapping the power button to start your computer. You can stop holding the Command (⌘) and R keys when you see an Apple logo and progress bar. At the screen where Apple asks you to select a language, simply press enter. Now follow step 2 in Solution 1 (Boot your Mac in Safe Mode).
Reset your computer’s PRAM. A small amount of your computer’s memory, called “parameter random-access memory” or PRAM, stores certain settings in a location that OS X can access quickly. The particular settings that are stored depend on your type of Mac and the types of devices connected to it. The settings include your designated startup disk, display resolution, speaker volume, and other information.
- Shut down your Mac.
- Locate the following keys on the keyboard: Option, Command (⌘), P, and R. You will need to hold these keys down simultaneously in step 4.
- Turn on your Mac.
- Immediately press and hold the Option-Command-P-R keys. You must press this key combination before the gray screen appears.Continue holding the keys down until your Mac restarts, and you hear the startup sound for the second time.
- Release the keys.
Resetting PRAM may change some system settings and preferences. Use System Preferences to restore your settings.
Reinstall OS X. Make sure your laptop is powered with a charger. This procedure should not be performed while on battery power. Load your Mac in Recovery Mode: press and hold the Command (⌘) and R keys while pushing the power button to start your computer. You can stop holding the Command (⌘) and R keys when you see an Apple logo and progress bar. At the screen where Apple asks you to select a language, simply press enter. Select Reinstall OS X and then click Continue. Follow the onscreen instructions. In the pane where you select a disk, select your current OS X disk (in most cases, it’s the only one available).