How to use Apple Diagnostics on your Mac

1. Shutdown your macbook 2. Press Power. 3. Press HOLD the letter D. Apple Diagnostics tests your Mac for hardware issues and suggests solutions. After isolating an issue on your Mac to a possible hardware issue, you can use Apple Diagnostics to help determine which hardware component might be causing the issue. Apple Diagnostics also suggests solutions and helps you contact Apple Support for assistance. If your Mac was introduced before June 2