Boot your computer from that USB drive instead of your hard drive.
is your computer’s short-term memory. It holds the data your processor needs right now —from your open browser tabs to your active game session. When RAM starts to fail, your system becomes unpredictable. You might see the dreaded Blue Screen of Death (BSOD), sudden reboots, application crashes, or corrupted files.
Use the included "ImageWriter" to install the tool onto a spare USB drive. how to run memory diagnostics
Hardware issues can be tricky to isolate. RAM failure often mimics software bugs or overheating. Look out for these common warning signs:
The test runs automatically. By default, it performs a "Standard" pass. You can press F1 to change the settings to "Extended" for a more thorough (but much slower) scan. Boot your computer from that USB drive instead
Apple provides a built-in hardware suite to check for RAM issues, though the method depends on your processor type.
Files you use frequently or save recently suddenly become unreadable. When RAM starts to fail, your system becomes unpredictable
Modern Macs, particularly those with Apple Silicon, have soldered RAM that is not user-replaceable. However, if you suspect a hardware issue, you can run Apple Diagnostics.
The software executes 4 consecutive passes through your memory banks.
Press F10 to apply the changes. Let the test run for at least .
Overclocking profiles (Intel XMP or AMD EXPO) can sometimes cause instability. Enter your motherboard BIOS, disable these profiles to run the RAM at stock factory speeds, and test again.