12 Things to Check Before Buying Second-hand MacBook
Mac Tips

12 Things to Check Before Buying Second-hand MacBook

Before we start


Sometimes you don’t really need a new Mac—you just need to breathe new life into the old one! If you feel you want to buy a new device just because your current one is performing badly—then download MacKeeper and let it start rejuvenating your device.


MacKeeper can easily clean off junk, useless apps, and duplicates from your old Mac, which may lead to optimized performance and faster operation. See for yourself!


Are you a Windows-to-Mac switcher with a limited budget? Then buying a refurbished Mac with a warranty and tech support included sounds like the best option. Alternatively, you can save extra money by purchasing a used Mac. We’ll walk you through all necessary steps you should take to ensure the Mac you are purchasing won’t crash the very next day.


Note: It’s a great idea to perform some basic diagnostics when you meet your seller. So, remember to take an external USB drive with macOS preinstalled, and headphones.



Step 1: Check for damages

Start diagnostics by carefully examining the body of the used Mac for any physical damages, such as visible scratches. Next, check all the screws. Any loose screws can be a sign that the Mac has been serviced by a non-authorized repair service. Also, make sure the screen and the case aren’t bent.  


Finally, check the display hinges (the joints that hold the display and case together). These hinges should be powerful enough to support the lid and prevent it from casually falling.


If you find any damages when buying a used Mac, you could use it to bargain.

Step 2: Check how old that Mac is

Does the current Mac owner claim the Mac is in like-new condition? That may be true, but that doesn’t mean it’s actually new. You can check the actual age of the Mac by going to About This Mac section of the Apple menu in the upper left corner of the screen.

macbook production year in about this mac menu

If macOS is not installed on the used Mac you’re examining, you can check its age with its serial number. Turn the Mac over and you’ll find the serial number next to the regulatory markings. Use these resources to identify the Mac model and its age, as well as its warranty and support at the Apple’s coverage check webpage

Step 3: Boot this Mac

Time to give this Mac a whirl. Make sure the machine you want to buy starts and macOS loads all the way to the desktop picture. If macOS is not installed on this machine, use the bootable drive you brought with you (the one with macOS on board). Hold down the Option key once you hear the startup chime and select the external startup drive.


If the Mac doesn’t boot, it’s not really a deal-breaker. You can check out our tips on what to dо if a Mac doesn't turn on. However, it’s up to you to decide whether you’re ready to overcome such obstacles. And if you are, it might be another reason for a discount on the second-hand Mac.

Step 4: Disable firmware password

Mac users set up various passwords for their devices, but one of them can be a real headache for the new Mac owner. Bad news if the seller set up a firmware password on their device — you won’t be able to start your Mac from the USB drive. When booting a Mac and hearing a startup chime, hold down the Option key. If you’re prompted to type in the firmware password, ask the Mac owner to turn it off.


Here’s how to disable firmware password:

  1. Turn off the Mac
  2. Turn it on again and hold down Command (⌘) + R keys immediately afterwards
  3. Release the keys when you see a lock icon and a password field
  4. Ask the Mac owner to enter the firmware password
  5. Click Utilities and select Firmware Password Utility or Startup Security Utility
  6. Click Turn Off Firmware Password
  7. Enter the firmware password when requested
  8. Quit the utility and restart the Mac

Step 5: Check the display condition

To spot defective pixels on the display, go to a dead pixels checker that fills your screen with pure colors. Alternatively, open pictures with a mono-colour background (red, green, blue, white, or black) on the used Mac. If any pixels are damaged, you’ll notice small spots on the display.


It’s ok if there’s a dead pixel or two. However, if there are groups of broken pixels, then you probably shouldn’t buy this used MacBook.

Looking ahead, if you need any advice or have any specific questions regarding the device you’ve chosen, you can always install MacKeeper and message/call our tech expert.


Our team would love to help you choose the best device for you, and they will also explain  how to use MacKeeper effectively to prolong your Mac’s life.

Step 6: Run a keyboard test

Use the macOS built-in Text Edit app to make sure the keyboard is not malfunctioning. Open it and type every keyboard character. Works fine? Now try the Caps Lock button and functional keys. Works perfectly? Great!

keyboard test in text edit

Alternatively, you may use Keyboard Viewer. Go to the language menu at the top menu bar, and select Show Keyboard Viewer. Now every key you hit is displayed in the new keyboard-like window.

keyboard viewer open on British keyboard

Step 7: Check the optical drive

If the Mac you’re about to buy has the optical drive, insert a DVD or a CD disk to check if it reads information.

Step 8: Check all ports

It’s easy to do. Just connect your external drive to the USB port. Do the same with the headphones. Works? Amazing!

Step 9: Run webcam diagnostics

Launch the Facetime app or the Apple’s Photo Booth app to test the iSight camera. Can you see your face in the app window? That means your webcam works perfectly.


If you encounter a pop-up message saying “There is no connected camera”, change your app’s default camera to the iSight camera. If this problem persists, it could be a sign of camera issues.

Step 10: Check hard drive

Disk Utility is a handy tool to help you examine the Mac’s hard drive health.  


Here’s what to do:

  1. Go to Applications in Finder
  2. Choose Utilities
  3. Select Disk Utility
  4. Click on First Aid in the menu above
  5. Click Run

The checkup will take a while and once you’re done, you’ll see a window with a list of messages regarding the status of your hard drive. If you notice any messages in red, it means that something is wrong with the disk.

checking hard drive with First Aid in Disk Utility

A MacBook with a failing hard drive can be a big headache, but it’s not the end of the world. You can always fix or replace it. If this is the case, then make sure to get a discount from the seller.

Step 11: Check the battery

MacBooks are known for their outstanding battery performance, so you want to make sure the Mac you buy won’t drain after just an hour or so of use.


To check your Mac’s battery health:

  1. Click on the Apple Logo
  2. Hold down the Option key
  3. Select System Information from the drop-down menu
  4. Open the Power section in the left sidebar menu
  5. Pay attention to the Health Information section
battery health information in system information

Cycle count and Condition will help you diagnose the Mac’s battery health. Most Mac batteries tend to last between 300 and 1000 charge cycles. Here you can find more information on battery cycle count for different Macs. Make sure the battery cycle count and health are within the limit. As a general rule, the less battery cycle count the better.

Step 12: Apple Hardware Test

The final step we recommend is an Apple Hardware Test (or Apple Diagnostics on newer Macs). It detects issues with the logic board, memory, and other hardware components.  


To start Apple Hardware Test:

  1. Disconnect all external devices and turn off the Mac
  2. Turn it back on and hold the D key once you hear the startup chime
  3. Select the language you need and press the arrow button to run the test


For more information, check out this article on Apple Diagnostics.

To make sure your second-hand Mac serves you well for years, it’s necessary to keep it clean, secure, and optimized.


Download MacKeeper and never worry about junk, malware, viruses, or bad performance again. The app allows you to keep your Mac in the best condition, protect your personal data, and ensure it’s not clogged with trash. Try now!


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