If you've just installed, or are trying to install, macOS Catalina, you may be experiencing some issues. There are a few standard troubleshooting steps you can try before burning everything to the ground.
- Mac Slow Boot Caused By Waiting For Desmos High Sierra Park
- Mac Slow Boot Caused By Waiting For Desmos High Sierra 10
- Mac High Sierra Slow Startup
- Mac Slow Boot Caused By Waiting For Desmos High Sierra Ca
Dec 13, 2017 Re: Very slow resume after upgrading to High Sierra and VMWare 10 gr2020 Dec 13, 2017 9:29 AM ( in response to Mohannad ) +1.
Here are some things you can try to figure out what's wrong and perhaps alleviate some of your macOS woes.
Aug 05, 2016 I'm on a desktop Mac from late 2012 running Yosemite (10.10.5) and it's been running absolutely fine for months until this last week when I've suddenly been experiencing extremely slow boot up times. This morning, it took almost half an hour to boot-up! Nov 05, 2017 High Sierra Laptop Guides. Mac OSX fails to boot, Panic in DSMOS. Only notable differences are now in verbose boot OSX pauses at 'Waiting for DSMOS' before.
Before troubleshooting
Figure out where the problem lies. If it's in downloading or installing macOS Catalina, then fair enough. If, however, you're only having trouble when using certain apps, then it's best to try and isolate the issue to just those apps. If it's a single app, try uninstalling and reinstalling or checking for updates.
What to do if Catalina doesn't seem to be downloading or installing
If you're trying to download macOS Catalina and it seems to just hang and not calculate or appear to be downloading or installing, first double-check to make sure your internet connection is working and your Mac is connected to the internet. Then, try downloading it directly from Apple's software downloads page.
- Navigate to Apple's Catalina download page on your Mac.
- Click Download under the macOS Catalina download section.
- Follow the steps to install macOS Catalina the same way you would through System Preferences.
What if macOS Catalina freezes or stops responding?
You can start by waiting. If you have time, leave your Mac for a while. It might work itself out after half an hour.
If you can't wait or waiting just doesn't work, you'll have to force a reboot. First, try by holding down the power button on your Mac and waiting until it shuts off and turns back on.
If your Mac won't even respond to the power button, then as a last resort, you can simply unplug it. Unplugging it should be the last thing you try since you could end up bricking it altogether.
What to do if macOS Catalina won't restart
Boot in Recovery Mode
If your Mac boots up and just sits in a gray screen or you just get spinning wheel of death from the start, try booting in Recovery Mode. Here's how:
- Turn off your Mac.
- Turn it on and hold Command-R until you hear the startup chime or see the Apple logo.
- Click Disk Utility when the macOS Utilities window shows up.
- Click the disk that's running Catalina.
- Click Repair Disk.
Wait for the repair to run. Your Mac will likely restart when it's finished.
Change partitions
If you've done things the smart way and partitioned your Mac's hard drive, start up your Mac from the Catalina partition and troubleshoot from there.
If all else fails, just wipe the Catalina partition and start all over again.
Any other troubleshooting tips?
Let us know in the comments below!
macOS Catalina
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Mac won't start/boot after macOS High Sierra update/installation, help!
'I upgraded my iMac into latest macOS High Sierra last night. And when I completed the update process, tried to start the computer. It won't boot.
I tried to hard reboot Mac computer, but nothing showed up. What else can I do to wake up the computer and make it work again with macOS High Sierra?'
I tried to hard reboot Mac computer, but nothing showed up. What else can I do to wake up the computer and make it work again with macOS High Sierra?'
Although Mac hard drive boot failure issue is not a new problem anymore. But it's still a tough case for ordinary users to fix when their Mac computers fail to boot after macOS High Sierra update or installation. If you are having such a problem, relax! This tutorial article will show you how to quickly fix and resolve Mac hard drive won't boot issue after macOS High Sierra update. Just follow any one of offered methods to get your Mac computer back to work again now:
Quick Fix 1. Reset SMC to fix Mac won't boot after High Sierra update
Sometimes, if the Mac computer cables are not connected properly, you may not be able to boot it normally. So if Mac cannot boot after system update, you can reset SMC to fix Mac won't boot issue after macOS High Sierra update:
1. Shut down Mac computer and unplug all cables;
2. Wait for a few minutes and then plug the cables back;
3. Restart Mac computer to see if you can enter the system or not.
2. Wait for a few minutes and then plug the cables back;
3. Restart Mac computer to see if you can enter the system or not.
Quick Fix 2. Force to reboot Mac and reset NVRAM to fix Mac won't boot issue
1. Press and hold Power button for a few minutes till Mac turns off;
2. Wait a few seconds and press Power button to turn on Mac;
3. Hold Command + Option + P + R keys while booting Mac to reset NVRAM;
4. Reboot computer again to see if the problem gets solved or not.
2. Wait a few seconds and press Power button to turn on Mac;
3. Hold Command + Option + P + R keys while booting Mac to reset NVRAM;
4. Reboot computer again to see if the problem gets solved or not.
Note: If these two quick fixes didn't help, continue with below complete solutions to get your problem resolved now.
Mac Slow Boot Caused By Waiting For Desmos High Sierra Park
Complete solution to fix Mac won't boot/fails to boot error after macOS High Sierra update
Step 1. Recover data when Mac hard drive won't boot from High Sierra
If you have important data saved in Mac computer hard drive, do remember to restore data before taking actions to fix Mac won't boot error.
Professional Mac data recovery software with bootable disk can help you effectively restore your data out of Mac hard drive when the computer fails to boot. You can directly purchase EaseUS Data Recovery Wizard for Mac with Bootable Media to create a bootable media for Mac and apply it to restore data from fail to boot Mac computer now:
1. Insert the created bootable media into Mac and turn on Mac computer, immediately press and hold the Option key and select EaseUS Data Recovery Wizard for Mac to boot;
2. Connect an external storage device to Mac computer;
When EaseUS Data Recovery Wizard for Mac launches, follow this tutorial to restore lost files on Mac.
2. Connect an external storage device to Mac computer;
When EaseUS Data Recovery Wizard for Mac launches, follow this tutorial to restore lost files on Mac.
Step 2. Fix Mac won't boot error after macOS High Sierra update
Fix macOS High Sierra won't boot issue
Method 1. Boot Mac from Safe Mode to fix Mac won't boot issue
1. Turn on Mac, press Shift when you hear the startup sound and release it till you see Apple logo;
2. After Mac fully starts, restart the computer normally without holding any keys/buttons.
3. Wait patiently till Mac computer finish the reboot process.
2. After Mac fully starts, restart the computer normally without holding any keys/buttons.
3. Wait patiently till Mac computer finish the reboot process.
Mac Slow Boot Caused By Waiting For Desmos High Sierra 10
Method 2. Use Disk Utility to restore Mac from Recovery Mode when macOS High Sierra won't boot
1. Boot Mac up, press Command + R during the boot-up process;
2. Click Disk Utility option > Click First Aid and try repairing Mac's disk;
3. Disk Utility will automatically run a fsck (file system check) operation to help you repair macOS High Sierra fail to boot error;
4. If this fails, try restore from Recovery mode.
5. Reinstall OS X in Recovery Mode will automatically download and install the latest macOS High Sierra for your Mac device.
2. Click Disk Utility option > Click First Aid and try repairing Mac's disk;
3. Disk Utility will automatically run a fsck (file system check) operation to help you repair macOS High Sierra fail to boot error;
4. If this fails, try restore from Recovery mode.
5. Reinstall OS X in Recovery Mode will automatically download and install the latest macOS High Sierra for your Mac device.
Method 3. Run Terminal to repair Mac hard drive won't boot error due to High Sierra update
![Mac high sierra slow startup Mac high sierra slow startup](/uploads/1/2/6/6/126646478/378386246.jpg)
1. Open Terminal > Applications > Utilities;
Enter: system_profile SPExtensionsDataType > ~/Desktop/kextList.txt and hit return;
2. Open the kextList.txt file on desktop > Press Apple(Command) + F to bring up find;
3. In the find field insert 'Obtained from: Not Signed' and copy the destination to the .kext file to a list for use later;
4. Click Next to cycle through all of them, for example: /System/Library/Extensions/JMicronATA.kext
5. Browse your drive to /System/Library/Extensions and remove all unsignedkext files;
6. Reboot and your Mac boot problem shall be all set.
Enter: system_profile SPExtensionsDataType > ~/Desktop/kextList.txt and hit return;
2. Open the kextList.txt file on desktop > Press Apple(Command) + F to bring up find;
3. In the find field insert 'Obtained from: Not Signed' and copy the destination to the .kext file to a list for use later;
4. Click Next to cycle through all of them, for example: /System/Library/Extensions/JMicronATA.kext
5. Browse your drive to /System/Library/Extensions and remove all unsignedkext files;
6. Reboot and your Mac boot problem shall be all set.
Method 4. Reinstall macOS High Sierra to resolve Mac won't boot issue
Mac High Sierra Slow Startup
The last method that you can try is to download macOS High Sierra and create a new bootable drive to clean install macOS High Sierra on Mac computer so to make it boot up normally and work smoothly again.
1. Connect USB bootable drive on Mac and restart Mac by holding Option till you hear the reboot tone;
2. Select disk called Install macOS High Sierra in the drive list that appears on screen;
3. Once USB drive is booted, select Disk Utility > Choose Mac's startup from the list > Click Erase;
4. Once Mac's startup disk is formatted, return toUtilitieswindow and select Install macOS > Choose just erase startup drive to install macOS > Follow onscreen prompts to complete the installation.
2. Select disk called Install macOS High Sierra in the drive list that appears on screen;
3. Once USB drive is booted, select Disk Utility > Choose Mac's startup from the list > Click Erase;
4. Once Mac's startup disk is formatted, return toUtilitieswindow and select Install macOS > Choose just erase startup drive to install macOS > Follow onscreen prompts to complete the installation.
Mac Slow Boot Caused By Waiting For Desmos High Sierra Ca
This may take you a few hours to complete the task. And of course, if you have important data, follow Step 1 to get all saved data out firstly.