Apple MA200Y/A iMac Manual - Page 87
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 computer's 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 Insert the Mac OS X Install Disc 1 that came with your iMac. 3 Restart your iMac and hold down the "D" key as it starts up. 4 Select the language appropriate for your location when the Apple Hardware Test language chooser screen appears. 5 Press the Return key or click the right arrow button. 6 When the Apple Hardware Test main screen appears (after about 45 seconds), follow the onscreen instructions. 7 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 may be software-related. For more information about Apple Hardware Test, see the Apple Hardware Test Read Me file on the Mac OS X Install Disc 1. Chapter 5 Troubleshooting 87