Apple MacBook Pro 17-inch (original, Core 2 Duo, 2.4GHz, Late 2007 CTO, Early 2008, and Late 2008) - Manual (Page 172)

MacBook Pro 17-inch (original, Core 2 Duo, 2.4/2.6GHz, 2008) Troubleshooting — Hardware Symptom Charts 172
Ts0P Top case
Th1H Thermal sensor on heatsink
TG0H Bottom case thermal sensor near right fan
Th2H Bottom case thermal sensor near left fan
Verify that the left I/O board cable is securely connected and shows no signs of wear. 11.
Try known-good left I/O board. 12.
Check that the thermal material between the heat exchanger and logic board is in contact 13.
by unscrewing the logic board screws and gently pulling up on the left side of the board
to verify resistance caused by adhesion of the thermal material. If not, reinstall new thermal
material for the processor, system controller, and video chips (see Logic Board Take apart).
Replace the logic board. 14.
System shuts down almost immediately after startup
Disconnect all external peripherals and eject any ExpressCard. 1.
Make sure a known-good battery is fully inserted. Check battery charge and make sure that 2.
at least two LED charge indicators light up; otherwise connect the adapter. The adapter LED
should light when plugged in. If not, consult the MagSafe power adapter section for further
troubleshooting.
After charging for a while, if the battery does not seem to charge, or if it is charged up but 3.
quickly discharges, replace the battery. Verify with a known-good battery.
Check battery connection to logic board, and check wire attachment to connectors. 4.
If just before the system shuts down, the sleep LED briefly comes on, check the three thermal 5.
sensor connections to the main logic board. They should be fully seated with no damage to
the wiring. If any thermal sensor is damaged, replace it.
If a known-good battery does not charge, replace the left I/O board. 6.
Replace the logic board. 7.
Application Quits, Kernel Panic or other booting problems
If a specific application quits, replace the application. Verify that the application is compatible 1.
with OS X.
Reset PRAM. (After restart, hold down the Command-Option-P-R keys until you hear the 2.
startup chime at least one additional time after the initial startup chime).
Run Disk Utility from the Software Install and Restore DVD. 3.
Reboot the system. 4.
Run Apple Service Diagnostic (ASD) in loop mode (Control-L) for an extended time to test 5.
the memory. If the test finds bad memory, replace the DIMMs one at a time and test until all
bad DIMMs are replaced with known-good modules.
Replace the logic board. 6.