Specifications

General Information
What’s New and Different (2003):
1. The iMac (Flat Panel) with serial number xx305xxxxxx or later (released in February 2003) will start up
only in Mac OS X. This model can run Classic, but it will not start up in Mac OS 9. You can also identify
iMac (Flat Panel) units that only boot to Mac OS X by the Boot ROM information in the Apple System
Profiler. Under System Profile > Hardware Overview > Boot ROM info should read 4.5.0f4 or later for
iMac (Flat Panel) machines which only boot to Mac OS X.
2. Bluetooth is available via the external USB Bluetooth adapter (sold separately).
3. The new service parts for the 15” 800 MHz model are:
• 661-2841 Board, Logic, 800 MHz, Ver. 2
• 661-2803 Hard Drive, 3.5”, 60GB
• 661-2806 Drive, DVD-ROM/CD-RW (Combo), 32X
What’s New and Different (2002):
1. Important: The logic board has 3 thermal pads on the bottom side of the logic board. These pads must
be changed each time the main logic board is removed from the bottom housing. Failure to replace these
pads may cause the microprocessors to overheat and become damaged. (An exception would be if you
are simply testing the logic board and only detach it for a few minutes.)
Refer to the Take Apart chapter, “Thermal Pad Installation”.
2. Important: The CPU uses a thermal pipe to transfer heat away. This pipe has a thermal connection to
the top metal chassis (Faraday cage). This connecting point must be cleaned and have new thermal
paste applied to it each time the bottom housing is removed. If the mating surfaces are not cleaned and
thermal paste is not used, the CPU may overheat and become damaged. There is no exception to this.
Note: Most service procedures require the bottom housing to be removed.
Refer to the Take Apart chapter, “Thermal Paste Application”.
3. Important: The bottom plate has 4 screws that must be tightened to at least 17 in.-lbs. If you do not
have a torque driver, you will have to make sure these bolts are firmly tightened (by hand or purchase the
service tool (076-0899) in order to ensure the thermal pipe is firmly mated with the top base. If the
bottom plate is not securely attached to the base in this fashion the CPU may overheat and become
damaged.
4. Special service tools are required to perform some procedures. A service stand, 076-0898, to hold the
unit during take apart and service cables, 076-0897, that allow the unit to run while the bottom housing is
open. Important: Diagnostic service cables allow the unit to run while the bottom housing is open;
however, the computer cannot run for more than five minutes with the bottom housing open. If it is open
longer, the CPU may overheat and become damaged.
5. The CPU is now G4 based, running at speeds of 700 MHz and 800 MHz.
General Information
iMac (Flat Panel) Troubleshooting - 1