Apple MB950LL iMac Manual - Page 43
Using Apple Hardware Test
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Using Apple Hardware Test You can use Apple Hardware Test to help determine if there is a problem with your iMac hardware. To use Apple Hardware Test: 1 Disconnect all external devices from your iMac except the keyboard and mouse. If you have an Ethernet cable connected, disconnect it. 2 Restart your iMac while holding down the D key. 3 When the Apple Hardware Test chooser screen appears, select the language appropriate 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 Apple Hardware Test displays an error code if it detects a problem. Make a note of the error code before pursuing support options. If Apple Hardware Test doesn't detect a hardware failure, the problem may be with your software. For more information, see the Apple Hardware Test Read Me file on the Mac OS X Install Disc 1. Chapter 4 Problem, Meet Solution 43