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how to scan and diagnose hardware issues on your mac first you will need to open the top of your Mac and remove the battery. Next, you will need to plug your external monitor into the VGA port. You will then need to open the menu bar on your computer and click on "System Preferences". From here, you will need to click on "Displays" and click on the "Detect Displays" button. If you have a spare external monitor, plug it into the HDMI port and repeat this process. This will allow you to see a screen with a green bar and a red bar. The green bar represents the current settings of your monitor while the red bar represents your current settings. If there is a problem with your monitor, the red bar will be much bigger than the green bar.
