Manual
Page 51
... you suspect a problem with the MacBook Pro hardware, you can use Apple Hardware Test: 1 Disconnect all external devices from your computer and hold down the D key as the memory or processor. Click the "Assist me" button to help determine if there is a problem with Your Internet Connection Your MacBook Pro has the Setup Assistant application to...
... you suspect a problem with the MacBook Pro hardware, you can use Apple Hardware Test: 1 Disconnect all external devices from your computer and hold down the D key as the memory or processor. Click the "Assist me" button to help determine if there is a problem with Your Internet Connection Your MacBook Pro has the Setup Assistant application to...