Apple MacBook Pro 17-inch (original, Core 2 Duo, 2.4GHz, Late 2007 CTO, Early 2008, and Late 2008) - Manual (Page 158)

MacBook Pro 17-inch (original, Core 2 Duo, 2.4/2.6GHz, 2008) Troubleshooting — General Information 158
partition on the internal hard drive.)
When the AHT chooser screen appears, select the language for your location. 3.
Press the 4. Return key or click the right arrow button.
When the Apple Hardware Test main screen appears (after about 45 seconds), follow the on- 5.
screen instructions.
If Apple Hardware Test detects an issue, it displays an error code. Make a note of the error 6.
code before pursuing support options. If Apple Hardware Test doesn’t detect a hardware
issue, the issue may be software related.
If this method is not successful, use AHT from the MacBook Pro OS X Install DVD..
To use AHT from the DVD:
Insert the DVD named “MacBook Pro Mac OS X Install Disc 1” that came with your computer. 1.
Hold down “D” and restart the computer. 2.
Follow the on-screen instructions. 3.
Apple Service Diagnostic (ASD)
Apple Service Diagnostic (ASD) 3S108 for MacBook Pro (17-inch) •
Apple Service Diagnostic (ASD) 3S109 for MacBook Pro (17-inch Core 2 Duo) •
Apple Service Diagnostic (ASD) 3S114 for MacBook Pro (17-inch 2.4GHz) •
Apple Service Diagnostic (ASD) 3A121 for MacBook Pro (17-inch Early 2008)* •
Notes:
ASD version numbers may change as diagnostics are updated. •
Some older diagnostics are not on the 3S109 disk. Please keep a copy of the 3S108 disk. •
*Important: ASD 3S121 requires installation onto an external USB hard drive. See section below.
Installing Apple Service Diagnostic on a USB hard drive:
Connect the external USB hard drive to your Macintosh. 1.
Open Disk Utility (located in /Applications/Utilities). 2.
Select the external USB hard drive. 3.
Click the Partition tab to prepare the drive to be partitioned into two volumes, as follows: 4.
For ASD (OS), the partition size must be 5.4GB or larger. Name this volume ASD OS 3S121. -
For ASD (EFI), the partition size must be 20MB or larger. Name this volume ASD EFI 3S121. -
Click on Options and select GUID Partition Table as the partition scheme. 5.
Click Partition to partition the hard drive. 6.
In the Finder, double-click on the ASD 3S121.dmg file to mount the image. Within it are two 7.
disk images, one for EFI, ASD EFI 3S121.dmg, and one for OS X, ASD OS 3S121.dmg volume.