User Guide
Page 53
.... 3 Restart your computer and hold down the D key as the memory or processor. If you have trouble with your Internet connection, you can try the steps in this section for your computer except the power adapter. Using Apple Hardware Test If you suspect a problem with the MacBook Pro hardware, you can use Network Diagnostics.
.... 3 Restart your computer and hold down the D key as the memory or processor. If you have trouble with your Internet connection, you can try the steps in this section for your computer except the power adapter. Using Apple Hardware Test If you suspect a problem with the MacBook Pro hardware, you can use Network Diagnostics.