• Shut down your Mac.
    • Wait until your computer turns off and after that press the Power button.
    • Right after you hear the startup tone, press and hold the Shift key.
    • Release the Shift key when you see a grey Apple sign and the progress bar below this sign.
    • Once you see Desktop, start a Disk Utility scan to detect and repair file system errors (don't forget to choose your main hard drive).
    • Click on Verify Disk and then, if asked to fix problems, on Repair Disk.
    • After this, click on Verify Disk Permissions and then on Repair Disk Permissions.
    • After the process is finished, shut down your Mac and turn it back on after about 30 seconds.

    Please reset the System Management Controller (SMC):

    • Shut down the computer.
    • Disconnect everything from the computer except for the power.
    • Once the computer is off, press the Shift-Control-Option keys (on the left side) and the power button at the same time. Hold all 4 keys for about 5-6 seconds.
    • Release the keys and the power button at the same time.
    • Press the power button to turn on the computer.

    We'd also suggest upgrading your RAM.

    1. To boot your Mac in Safe Mode please be sure your Mac is shut down. Press the power button to turn on the computer. Immediately after you hear the startup sound, press and hold the Shift key. The Shift key should be pressed as soon as possible after startup, but not before the startup sound. Release the Shift key when you see a grey Apple sign and the progress bar below this sign. After the Apple logo appears, it may take longer than usual to reach the login screen. This is because your computer is performing a directory check as a part of Safe Mode. If your Mac starts up as expected, immediately try restarting.

      This will force the system to perform several maintenance routines and load essential system software. After this, you can reboot normally.

    2. If it didn't work, try to reset NVRAM and PRAM:

      • Shut down the computer again.

      • Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.

      • Turn on the computer.

      • Press and hold the Command-Option-P-R keys. You must press this key combination before the grey screen appears.

      • Hold the keys down until the computer restarts and you hear the startup sound for the second time.

      • Release the keys.

    3. Reset the SMC:

      • Shut down the computer.

      • Disconnect everything from the computer except for the power.

      • Once the computer is off, press the Shift-Control-Option keys (on the left side) and the power button at the same time. Hold all 4 keys for about 5-6 seconds.

      • Release the keys and the power button at the same time.

      • Press the power button to turn on the computer.

  • Some troubleshooting steps you can follow to fix this issue:

    • Try to reboot the Mac in safe mode to fix the error. To do so be sure your Mac is shut down. Press the power button. Immediately after you hear the startup sound, press and hold the Shift key. The Shift key should be pressed as soon as possible after startup, but not before the startup sound. Release the Shift key when you see the Apple logo appear on the screen. After the Apple logo appears, it may take longer than usual to reach the login screen. This is because your computer is performing a directory check as a part of Safe Mode.
    • Use the 'Disk Utility' to get rid of any hard drive error. If a disk has a problem repair it by 'Verify and Repair permission' options.
    • If a Mac shuts down due to overheating, then it is advisable to keep it off for a while to cool it down. You can also apply thermal paste to reduce overheating of the drive.
  • Open your web browser with the 'Shift' key held down and check if any suspicious extensions left (I'd suggest you to uninstall all extensions):

    1. If you use Safari:

      • Open it and click on its name at the upper left corner of the Desktop, select Preferences (or Press 'Command(⌘) - ,(comma)') → Extensions, if you see any unknown extensions, click on their names and choose Uninstall.
        Examples of ad-injection extensions: Cinema-Plus Pro; Flashmall; GoPhoto; Omnibar; Shopy Mate. Spigot Extensions: Amazon Shopping Assistant; Ebay Shopping Assistant; Searchme; Slick Savings.

      • Use Command + Shift + G shortcut in order to use 'Go to Folder' option. Paste the following in order to remove Buca Apps, Conduit, Downlite, Genieo, MyBrand, Trovi, and Vsearch. Press Return. If there is no such item on your Mac you will see the message. If it opens new window with the item you have searched for, drag it to the Trash (this may ask for admin password):
        /Applications/cinemapro1-2.app
        /Applications/Genieo
        /Applications/InstallMac
        /Applications/Uninstall Genieo
        /Applications/SearchProtect.app
        /Applications/WebTools.app
        /Library/Application Support/Conduit/
        /Library/InputManagers/CTLoader/
        /Library/PrivilegedHelperTools/com.genieoinnovation.macextension.client
        /Library/PrivilegedHelperTools/Jack
        /System/Library/Frameworks/VSearch.framework
        /System/Library/Frameworks/v.framework
        ~/Applications/cinemapro1-2.app~/Library/Internet Plug-Ins/ConduitNPAPIPlugin.plugin
        ~/Library/Application Support/Genieo/
        ~/Library/Application Support/com.genieoinnovation.Installer/
        ~/Library/Internet Plug-Ins/TroviNPAPIPlugin.plugin

      • Restart your Mac and empty the Trash.

    2. If you use Google Chrome: open the browser, click on its name at the upper left corner of the screen and select Preferences (or Press 'Command(⌘) - ,') → Extensions, click on Trash icons to the right of extensions' names. Delete Chrome's cache files, and other browsing data (Please check this Google article: https://support.google.com/chrome/answer/95582).

    3. If you use Firefox: try resetting the web browser by taking steps from this Mozilla article: http://mzl.la/MnSTZB.

    Important: Following Step 3 instructions will reset Firefox to its default state. Most of user data will be moved into a special folder on your Desktop. If you need to recover the data, see this article: http://mzl.la/LOAFED.

  • Please never call phone numbers from fake security alerts. It’s a scam affecting your browser.
    Follow these steps:

    1. Force Quit Safari:

      • Press Command - Option - Esc keys together at the same time.

      • When Force Quit window appears, select Safari.

      • Press Force Quit button at the bottom of the window.

    2. Relaunch Safari holding the Shift key down.

    3. Navigate to Safari menu at the top - Preferences - Privacy - Cookies and website data. Click “Details” button. Remove the cookie related to this site, if there is one.

  • If everything is ok with your network, this may be cache or cookies issue.

    1. Try to reset Safari settings:

      • Open Safari.

      • Click on Safari menu at the top (to the right from the Apple logo).

      • Select Preferences - Privacy tab.

      • Click on Remove All Website Data.

      • Close Safari.

    2. Delete Safari cache files:

      • Click on Finder.

      • Look for GO menu at the top.

      • Click on GO and hold down the Option key. This will show the user library folder.

      • Click on Library and look for Caches folder.

      • In caches folder open ‘com.apple.Safari folder’.

      • Move the Cache.db file to the Trash.

    3. If this doesn’t help, try to turn off the Safari extensions:

      • Open Safari.

      • Click on Safari menu at the top (to the right from the Apple logo).

      • Select Preferences.

      • Find the Extensions tab.

      • Turn off all the extensions.

      • Relaunch Safari.

    1. If you have problems opening webpages in Safari, try these steps:

      • Navigate to Safari menu (At the very top right side of your screen next to Apple icon), choose "Quit Safari", press "Shift" button and while holding this button on your keyboard single click on the Safari icon on your Dock.

      • Open Safari - Preferences - Privacy - Remove All Website Data.

    2. If you still can’t load webpages, open the Go menu with Option (Alt) key pressed - Library, locate Safari folder and move it to your desktop. If this helps, you can move this folder to the Trash.

    3. As a final step, you may try this:

      • Shut down your Mac.

      • Wait until your computer turns off and after that press the Power button.

      • Right after you hear the startup tone, press and hold the Shift key.

      • Release the Shift key when you see a grey Apple sign and the progress bar below this sign.

      • Once you see Desktop, start a Disk Utility scan to detect and repair file system errors (don't forget to choose your main hard drive).

      • Click on Verify Disk and then, if asked to fix problems, on Repair Disk.

      • After this, click on Verify Disk Permissions and then on Repair Disk Permissions.

      • After the process is finished, shut down your Mac and turn it back on after about 30 seconds.

  • In case after the upgrade to Yosemite your computer stops connecting to Wi-Fi networks, you can try the steps below to fix this issue:

    • Open the Apple menu - System Preferences and select the Network section.
    • On the left, select Wi-Fi and after that in the Location menu at the top choose Edit Locations.
    • Once you see a small dialogue box, hit the [+] plus sign and add a new location (create a simple name so that you can easily find it in the list of available networks and press Done).
    • Connect to this new Wi-Fi network by choosing it from the list of available connections.
    • After that, hit the Advanced button.
    • Navigate to the DNS section and add the DNS servers manually (these can be either those given to you by your Internet Service Provider or Google’s DNS service, which is 8.8.8.8).
    • Select OK, after that click Apply for the changes to take effect.
    • Once you are ready with this, restart your Mac.

    If this doesn’t help, you need to contact your ISP or Apple Support.

  • If you have difficulties with Finder, the first thing you need to do is restart your Mac. If this doesn’t help, try the steps below:

    • Open the Go menu with the Option (Alt) key pressed - Library - Preferences and locate the file called ‘com.apple.finder.plist’.
    • Move it to the Trash and restart your computer.
  • If you have difficulties with iTunes, restart your Mac. If the problems remain, try updating the app to the latest version available at the moment. If these basic troubleshooting steps don’t work, you will need to follow the instructions below carefully:

    • Move iTunes to the Trash.
    • Open the Go menu with Option key pressed - Library - Preferences.
    • Locate the file called "com.apple.iTunes.plist" and delete it.
    • Restart your Mac, download iTunes from Apple’s official website and install the app once again.
  • If you have a serious problem with your Mac and usual troubleshooting steps (Safe Boot, Resetting NVRAM or System Management Controller etc.) don’t help, you may need to restore the computer to factory settings.

    The steps below will help you to do this:

    • First of all, save all the files you want to keep (photos, documents etc.) on a separate drive or in the cloud.
    • Make sure you are connected to the Internet.
    • Restart your Mac. Once it restarts and the grey screen appears, press and hold the Command and R keys until you see the Apple logo.
    • Select Disk Utility and click Continue.
    • Select your startup disk on the left and click the Erase tab.
    • Choose Mac OS Extended (Journaled) from the Format menu, enter a name, and then click Erase.
    • Select Reinstall OS X, click Continue, and then follow the instructions on your screen.
  • The temperature of your Mac may depend on the active applications and processes. Games and videos consume the CPU resources and thus increase the temperature of the computer. At the same time, simple Internet browsing and applications like Mail, Notes etc. don’t put a heavy load on the hardware. To determine what applications make your Mac hot, take a look at the instructions below:

    1. Open Finder - Applications - Utilities and select Activity Monitor, this will list all the software processes running. Look at the % CPU, which has the biggest number running. Try to quit or stop that process or processes.

    2. If this does not help, try resetting the System Management Controller:

      • Shut down the computer.

      • Disconnect everything from the computer except for the power.

      • Once the computer is off, press the Shift-Control-Option keys (on the left side) and the power button at the same time. Hold all 4 keys for about 5-6 seconds.

      • Release the keys and the power button at the same time.

      • Press the power button to turn on the computer.