When you use a USB stick as the storage medium, you can test the RAM properly without the macOS overhead. Install it on a USB stick, start your Mac, and then run it. For example, MemTest86 is a free tool you can use to check your computer's memory. You can check some components manually with the right tools. Of course, you won't get detailed feedback about how to fix your Mac there, either. For a more detailed report, you're better off booking a free appointment at the Genius bar. This tool is useful to rule out hardware issues, but it's pretty useless for troubleshooting purposes. ![]() For example, you might discover there's a problem with the computer's memory, but you won't know which stick of RAM is faulty or what's wrong with it. You can then check the reference code in Apple's database, but don't expect to learn too much. You need an internet connection to do this because your Mac downloads Apple Diagnostics before it runs it.Īpple Diagnostics can only tell you so much in the form of a reference code. Note: If Apple Diagnostics doesn't start, try holding Option+D instead. One example of this would be if you use a web-based spreadsheet tool, like Google Sheets, to crunch a lot of data. And some web apps can tax your machine just as much as native ones. Too many extensions and plugins negatively affect your browser's responsiveness. If you switch to a Mac-optimized browser like Safari, it will help, but you still might need to curb your tab addiction.īrowsers, in general, can be a source of poor performance. If you have hundreds of tabs open in a browser like Chrome, don't be surprised if you encounter memory issues.
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