Apple MacBook Pro (15-inch, Early 2011) - Manual (Page 59)

59 Chapter 4 Problem, Meet Solution
Using Apple Hardware Test
If you suspect a problem with the MacBook Pro hardware, you can use the Apple
Hardware Test application to help determine if there’s a problem with one of the
computer’s components, such as the memory or processor.
To use Apple Hardware Test:
1 Disconnect all external devices from your computer except the power adapter.
If you have an Ethernet cable connected, disconnect it.
2 Restart your computer and hold down the D key as it starts up.
3 When the Apple Hardware Test chooser screen appears, select the language for
your location.
4 Press the Return key or click the right arrow button.
5 When the Apple Hardware Test main screen appears (after about 45 seconds), follow
the onscreen instructions.
6 If Apple Hardware Test detects a problem, it displays an error code. Make a note of
the error code before pursuing support options. If Apple Hardware Test doesn’t detect
a hardware failure, the problem might be software related.
Problems with Your Internet Connection
Your MacBook Pro has the Network Setup Assistant application to help walk you
through setting up an Internet connection. Open System Preferences and click
Network. Click the “Assist me” button to open Network Setup Assistant.
If you have trouble with your Internet connection, you can try the steps in this section
for your type of connection or you can use Network Diagnostics.