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2021-01-14 13:57:58 • Filed to: macOS 10.15 • Proven solutions

Colors are heavily associated with emotions, and when macOS 10.15 shows multi-colored lines on your Mac’s screen, it can unsettle you as only a few other serious problems can. It can pop up randomly, keeping you in fear of when it’ll show up next, and how long it’ll prevent you from using your Mac.

To fix a Mac Book Air that has screen color lines on macOS 10.15, you need to, first of all, identify its root-cause.

Why is My Mac Screen White with Lines on macOS 10.15?

This problem can stem from hardware or software issues.

Hardware sources include

• Broken screens,
• Defective display flex cables,
• Over-heating
• Drained batteries
• Incompatible hardware parts, and
• A damaged graph card processor (GPU)

If it’s a software-related problem, it could be a result of

• Faulty display resolution settings
• A cluttered hard disk

Read on to find out how to trace the root cause of the problem and resolve it.

What to Do if macOS Shows Multi-Colored Lines on Screen

The first thing to do is to test your Mac with an external display. If the external display works perfectly while your Mac’s screen is still a mess, then the problem is definitely from your Mac’s display hardware. However, if the lines show up in the external display, then the source of the problem stems from other hardware and software defects, including the lack of sufficient space on your hard-disk for regular system operations, broken graph cards, etc.

If you’ve confirmed the problem isn’t coming from your mac’s display hardware, try the following solutions:

Solution 1: Make Sure your Mac is Fully Charged

The issue might stem from a drained battery, so make sure your Mac is fully charged. Turn off your mac, and then charge it for 4-6 hours, and then restart it. If the problem doesn’t go away, switch it off again while it’s charging, and then switch it back on again after some time.

If the problem isn’t caused by a low battery, then try the next solution.

Solution 2: Allow your Mac to Cool Off

An over-heated system can also give rise to colored lines on your Mac’s display. Turn off your fully-charged system and let it cool off in a few hours.

Solution 3: Declutter your Hard Disk

When there are colored lines on your macOS 10.15 screen, check to see if a yellow triangle is on the screen warning about your hard disk being nearly full. On average, your macOS needs between 15-20GBs to run normally.

Copy your movies, images, and music files to your cloud storage or external hard-disk, and then delete them from your Mac’s hard disk. Do whatever is necessary to create enough space for your macOS to operate normally.

Solution 5: Reset your Mac

The problem may be triggered by a mix up in your settings. Reset your device to rescind any new settings that might give rise to invasive colored lines on your screens.

To reset your Mac,

1. On your home screen, open go to “Settings > General Settings > Reset”

Solution 6: Reset your NVRAM

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Your Nonvolatile Random-Access Memory (NVRAM) is a small memory space where your Mac stores and accesses certain settings, including those related to display.

To reset your NVRAM,

1. Turn off your mac, and then turn it on, and then when you hear the second booting sound, press down the “Command + Option + P + R” keys simultaneously.

Note that after resetting your NVRAM, you need to restore the settings for NVRAM-related settings, including the speaker, startup disk selection, etc.

As a last-ditch attempt when none of these solutions work, you may need to turn your system over for physical inspection in an Apple service center.

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Optimized Storage helps you save storage space space by storing your content in iCloud and making it available on demand:

• When storage space is needed, files, photos, movies, email attachments, and other files that you seldom use are stored in iCloud automatically.
• Each file stays right where you last saved it, and downloads when you open it.
• Files that you’ve used recently remain on your Mac, along with optimized versions of your photos.

If you haven't yet upgraded to macOS Sierra or later, learn about other ways to free up storage space.

Find out how much storage is available on your Mac

Choose Apple menu  > About This Mac, then click Storage. Each segment of the bar is an estimate of the storage space used by a category of files. Move your pointer over each segment for more detail.

Click the Manage button to open the Storage Management window, pictured below.

Manage storage on your Mac

The Storage Management window offers recommendations for optimizing your storage. If some recommendations are already turned on, you will see fewer recommendations.

Store in iCloud

Click the Store in iCloud button, then choose from these options:

• Desktop and Documents. Store all files from these two locations in iCloud Drive. When storage space is needed, only the files you recently opened are kept on your Mac, so that you can easily work offline. Files stored only in iCloud show a download icon , which you can double-click to download the original file. Learn more about this feature.
  
• Photos. Store all original, full-resolution photos and videos in iCloud Photos. When storage space is needed, only space-saving (optimized) versions of photos are kept on your Mac. To download the original photo or video, just open it.
  
• Messages. Store all messages and attachments in iCloud. When storage space is needed, only the messages and attachments you recently opened are kept on your Mac. Learn more about Messages in iCloud.

Storing files in iCloud uses the storage space in your iCloud storage plan. If you reach or exceed your iCloud storage limit, you can either buy more iCloud storage or make more iCloud storage available. iCloud storage starts at 50GB for $0.99 (USD) a month, and you can purchase additional storage directly from your Apple device. Learn more about prices in your region.

Optimize Storage

Click the Optimize button to save space by automatically removing watched movies and TV shows. When storage space is needed, movies or TV shows that you purchased from Apple and already watched are removed from your Mac. Click the download icon next to a movie or TV show to download it again.

Your Mac will also save space by keeping only recent email attachments on this Mac when storage space is needed. You can manually download any attachments at any time by opening the email or attachment, or saving the attachment to your Mac.

Optimizing storage for movies, TV shows, and email attachments doesn't require iCloud storage space.

Empty Trash Automatically

Empty Trash Automatically permanently deletes files that have been in the Trash for more than 30 days.

Reduce Clutter

Reduce Clutter helps you identify large files and files you might no longer need. Click the Review Files button, then choose any of the file categories in the sidebar, such as Applications, Documents, Music Creation, or Trash.

You can delete the files in some categories directly from this window. Other categories show the total storage space used by the files in each app. You can then open the app and decide whether to delete files from within it.

Learn how to redownload apps, music, movies, TV shows, and books.

Where to find the settings for each feature

The button for each recommendation in the Storage Management window affects one or more settings in other apps. You can also control those settings directly within each app.

• If you're using macOS Catalina or later, choose Apple menu  > System Preferences, click Apple ID, then select iCloud in the sidebar: Store in iCloud turns on the Optimize Mac Storage setting on the right. To turn off iCloud Drive entirely, deselect iCloud Drive.
• If you're using macOS Mojave or earlier, choose Apple menu > System Preferences, click iCloud, then click Options next to iCloud Drive. Store in iCloud turns on the Desktop & Documents Folders and Optimize Mac Storage settings.
• In Photos, choose Photos > Preferences, then click iCloud. Store in iCloud selects iCloud Photos and Optimize Mac Storage.
• In Messages, choose Messages > Preferences, then click iMessage. Store in iCloud selects Enable Messages in iCloud.

• If you're using macOS Catalina or later, open the Apple TV app, choose TV > Preferences from the menu bar, then click Files. Optimize Storage selects “Automatically delete watched movies and TV shows.”
• In you're using macOS Mojave or earlier, open iTunes, choose iTunes > Preferences from the menu bar, then click Advanced. Optimize Storage selects “Automatically delete watched movies and TV shows.”
• In Mail, choose Mail > Preferences from the menu bar, then click Accounts. In the Account Information section on the right, Optimize Storage sets the Download Attachments menu to either Recent or None.

Empty Trash Automatically: From the Finder, choose Finder > Preferences, then click Advanced. Empty Trash Automatically selects “Remove items from the Trash after 30 days.”

Other ways that macOS helps automatically save space

With macOS Sierra or later, your Mac automatically takes these additional steps to save storage space:

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• Detects duplicate downloads in Safari, keeping only the most recent version of the download
• Reminds you to delete used app installers
• Removes old fonts, languages, and dictionaries that aren't being used
• Clears caches, logs, and other unnecessary data when storage space is needed

How to free up storage space manually

Even without using the Optimized Storage features described in this article, you can take other steps to make more storage space available:

• Music, movies, and other media can use a lot of storage space. Learn how to delete music, movies, and TV shows from your device.
• Delete other files that you no longer need by moving them to the Trash, then emptying the Trash. The Downloads folder is good place to look for files that you might no longer need.
• Move files to an external storage device.
• Compress files.
• Delete unneeded email: In the Mail app, choose Mailbox > Erase Junk Mail. If you no longer need the email in your Trash mailbox, choose Mailbox > Erase Deleted Items.

Learn more

• The Storage pane of About This Mac is the best way to determine the amount of storage space available on your Mac. Disk Utility and other apps might show storage categories such as Not Mounted, VM, Recovery, Other Volumes, Free, or Purgeable. Don't rely on these categories to understand how to free up storage space or how much storage space is available for your data.
• When you duplicate a file on an APFS-formatted volume, that file doesn't use additional storage space on the volume. Deleting a duplicate file frees up only the space required by any data you might have added to the duplicate. If you no longer need any copies of the file, you can recover all of the storage space by deleting both the duplicate and the original file.
• If you're using a pro app and Optimize Mac Storage, learn how to make sure that your projects are always on your Mac and able to access their files.