Open App In Safe Mode Macos

A few weeks ago, I considered here whether starting up in Safe Mode (with the Shift ket held) checks and repairs disks, as it has done in the past. I concluded then that macOS Catalina no longer does that. This article looks at what Catalina’s Safe Mode actually does.

Open App In Safe Mode Mac Os High Sierra
Open App In Safe Mode Mac Os 10
Mac Os X Safe Mode
Mac Stuck In Safe Mode
Mac Safe Mode Startup

Safe Mode will clear several caches and verify the startup disks. From the command line, or on remote systems, boot into Safe Mode using this: sudo nvram boot-args='-x' When you want to boot into “normal” mode again, change the startup parameters to nothing: sudo nvram boot-args=' Very handy article from the Apple Knowledge Base.

Apple’s current support page detailing Safe Booting was written over two years ago, and clearly hasn’t been updated for 10.15 yet. According to that, entering Safe Mode at startup does three things:

it verifies the boot disk and, if there are any directory issues with it, it attempts its repair;
it blocks the loading of many kernel extensions, startup and login items, and user-installed fonts;
it deletes font caches, the kernel cache, and other system caches.

The second of those limits its usefulness, as some of the blocked items prevent some sub-systems from working normally. If you’re trying to isolate a problem which affects one of those sub-systems, Safe Mode won’t help.

I’ve now performed Safe Boots on a MacBook Pro 2017 (without T2 chip) running both 10.15 and 10.15.1, and conclude that no useful check of the integrity of storage is performed any more, have compiled a list of kernel extensions which aren’t loaded in Safe Mode, and looked at some of the ‘caches’ which it rebuilds. Let me step you through some typical log entries from starting up in Safe Mode. As usual, times are given in decimal seconds, in local time UTC+0100.

As with all startups, the log entries open with two characteristic waypoints:
3.000000 system boot: [UUID] 3.000000 log class: in-memory begins
Note that the UUID/GUID given here appears to be unique to that startup, rather than any for that machine.

The first indication of Safe Booting appears very early in the log. I’ve always been uncertain how long to hold the Shift key for. In this case, less than a second from initiating the startup should have been fine.
3.054764 kernel SAFE BOOT DETECTED - only valid OSBundleRequired kexts will be loaded.

In 10.15, you will then see scattered entries referring to kernel extensions which haven’t been loaded, such as
3.352849 Kext com.apple.vecLib.kext is not loadable during safe boot; omitting its personalities.
In 10.15.1, there’s now a full listing by subsystem of all the kexts which aren’t loaded, which I reproduce at the end of this article.

Almost exactly one second after the initial log entry, the new Catalina Volume Group is prepared and mounted (just as in a regular startup):
4.080006 ROSV: apfs mounted RO and is the system volume of a volume group and mounted as the root fs: creating the shadow fs_root 4.080063 apfs_vfsop_mount:1463: mounted volume: Macintosh HD 4.081282 attempting kernel mount for data volume.. 4.084126 attempting kernel mount for vm volume..

There are no log entries which report that fsck_apfs is being run, nor of any results of that. This is almost unnecessary anyway: compare the time taken for Safe Boot in Mojave with that in Catalina, particularly if you have any snapshots which need to be checked. Safe Booting in Catalina – on my system at least – takes little longer than a regular startup. If you experience any different, please let me know.

One major task which appears in Safe Boots is a thorough rebuild of OpenDirectory databases. This is heralded by the log entry:
6.504643 opendirectoryd Safe boot is enabled

Every startup is followed by a quick clean-up of temporary files, which is performed by the Directory Helper:
6.516512 dirhelper Cleaning T/ older than 3 days 6.516518 dirhelper Cleaning TemporaryItems older than 3 days

Another new and important service which takes note of the Safe Boot is Endpoint Security:
6.517115 endpointsecurityd Safe Boot mode detected
As this subsystem is so new, and little-used still, the implications of this aren’t clear yet.

Shortly after that, the OpenDirectory rebuild swings into action, with a great many log entries such as
6.816245 opendirectoryd PlistFile Database '/private/var/db/dslocal/nodes/Default/sqlindex' passed integrity check 6.816455 opendirectoryd PlistFile Database closing '/private/var/db/dslocal/nodes/Default/sqlindex' 6.816568 opendirectoryd PlistFile Database removed '/private/var/db/dslocal/nodes/Default/sqlindex' along with journal file 6.823589 opendirectoryd PlistFile re-indexing '<private>' with type 'computers' 6.833248 opendirectoryd PlistFile re-indexing '<private>' with type 'users'
repeated many times, progressing through sharepoints, config and groups.

Open App In Safe Mode Mac Os High Sierra

Many of the caches which are cleared as user-specific, so don’t appear until after login. That process is marked by distinctive entries such as
loginwindow main | Login Window Application Started loginwindow -[SessionStateMonitor setLoginState:] | ************* login state: InitialStartup

Unfortunately, once user processes start up, finding anything among them to indicate specific caches being cleared is like looking for a needle in a haystack. When I have plenty of time (!), and fancy browsing the 58 MB of log entries again, I may revisit this. But I have no reason to doubt Apple’s claim that various user caches are cleared.

To return to Apple’s original list of what happens in Safe Mode, as far as Catalina goes:

if any verification of the boot Volume Group does take place (which doesn’t appear to be the case), it’s performed in secret;
it blocks the loading of many kernel extensions (listed below), startup and login items, and user-installed fonts;
it deletes font caches, the kernel cache (which I think is started afresh on the VM volume anyway), and other system caches;
it rebuilds OpenDirectory databases.

Appendix: List of Kernel Extensions Which Aren’t Loaded in Safe Mode (10.15, 10.15.1)

Open App In Safe Mode Mac Os 10

AGDCPluginDisplayMetrics.kext
AppleCameraInterface.kext – this means a built-in camera can’t be used
AppleFIVRDriver.kext
AppleGFXHDA.kext
AppleHDA.kext
AppleHDAController.kext
AppleHDAHardwareConfigDriver.kext
AppleHV.kext
AppleIntelKBLGraphics.kext
AppleIntelSlowAdaptiveClocking.kext
ApplePlatformEnabler.kext
AppleSMCLMU.kext
AppleSSE.kext
AppleThunderboltEDMService.kext – these may prevent use of some Thunderbolt devices
AppleThunderboltIP.kext
AppleUpstreamUserClient.kext
AudioAUUC.kext
DspFuncLib.kext
eficheck.kext – this means that firmware integrity checks aren’t performed on non-T2 models
fileutil.kext
IOAudioFamily.kext
IOAVBFamily.kext
IOBluetoothSerialManager.kext
IOgPTPPlugin.kext
IOHDAFamily.kext
IOUserEthernet.kext
msdosfs.kext – this makes the Mac unable to access MS-DOS file systems
nke.rvi.kext
OSvKernDSPLib.kext
pmtelemetry.kext
vecLib.kext
and user-installed kernel extensions. Apple hasn’t yet explained what will happen with loading of its new ‘SEXTs’, but I suspect that they too will be blocked.

This article explains how you can fix when Safari won’t open on your Mac. Several users have reported this issue. The problem is that Safari won’t load or start a window. And when this problem occurs, the spinning beach ball (or spinning wait cursor) is displayed because Safari cannot handle whatever happening, indicating Safari is unresponsive.

If you are having this problem, please try each step below until you resolve your problem.

Before you try anything, quit Safari and then try again. If Safari is unresponsive, the best way to quit is to right-click (control-click) the Safari icon in the Dock. Then select Quit.

Open app in safe mode mac os high sierra

This article explains what you can do if Safari won’t open at all. See this article instead, if Safari opens but won’t load a site.

See also: Safari kCFErrorDomainCFNetwork Error, Blank Page Fix

If quitting does not work, try force-quitting Safari and then try again if that fixes your problem before going on to the next. You can do so by clicking the Apple menu, Force Quit, and Safari.

See this article if Chrome won’t open.

Clear your history, cookies, and website data

On your Mac, open safari and go to History > Clear History and clear your history. Then, in Safari still, click Safari, Preferences, Privacy and Manage Web Site Data. Then click Remove all.

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Check for updates

Make sure that your Mac has the latest version of the macOS software. To update your Mac, click the Apple menu, System Preferences, and Software Update. And if there is an update available, follow the onscreen instructions. Updating your software will also update Safari to the latest version.

Restart your Mac

Restart your Mac. Restarting may help you resolve your problem. To restart your Mac, click the Apple menu and then select Restart.

Safe mode

Restart your Mac in Safe Mode. Safe mode does certain checks and may resolve your problem. Here is how you can do this:

Turn off your Mac.
Turn on your Mac and immediately press and hold the Shift key.
Release the Shift key when you see the login screen. And login (you may have to log in a few times).
Now your computer is in Safe Mode. Test Safari in Safe Mode too.
In either case, exit Safe Mode by restarting your Mac normally without pressing the Shift key.
And then test Safari again if you can open it.

Manage your extensions

A Safari extension may cause this problem. You can easily figure out if this is the case by turning off extensions. Here is how:

Mac Os X Safe Mode

Open Safari, I know it is not opening but you will see the Safari menu bar.
In the Safari app, click Safari > Preferences.
Click the Extensions tab.
And turn off all extensions by deselecting the checkboxes “Enable… extension.”
Now try to open Safari. Does it load? If you can now open Safari without any issue, then one of your extensions is causing this problem. Enable one extension at a time until you find the extension that is causing this issue.
You can also try updating your extensions by clicking Updates in the lower-left corner.

Mac Stuck In Safe Mode

Delete Safari preference files

Mac Safe Mode Startup

Your problem may be caused by a corrupt preference file. Deleting may resolve your problem. Here is how:

Open a Finder window and press and hold the Option key, while holding the Option key, click Go and then Library.
Click Preferences.
Find the com.apple.Safari.plist file. And delete this file by dragging it to the Trash.
Then go back to the Preferences folder.
Find and click the Caches folder.
And find and delete the com.apple.Safari folder.
Then again go back to the Preferences folder.
Find and click the Containers file.
And find and delete the com.apple.Safari folder.

If you are still having this issue, you may want to reset Safari. If this also does not help you, you may want to reinstall macOS.

10% of battery left). Is there not a software package that is Mac compatible? Ups app for mac. I used Power Chute Personal in the day, but no more. Examples: When was the last time the battery took over, or how long was the outage, or a GUI of the current status, or something that allows me to pick when my Mac will automatically shut down (ex.

Servgol