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K Service Source




iMac
K Service Source




Hot Issues
iMac
Hot Issues Introduction - 1

Introduction
This chapter is designed to highlight unique or high-
priority product issues that you should be aware of before
servicing the iMac computer.

This chapter alerts you to important issues and provides
pointers to other areas in the manual where more complete
information can be found. This chapter is not intended to
replace other parts of this manual; it merely provides a
pointer to pertinent information in those chapters.

To familiarize yourself with a new product family, always
read the Basics chapter in its entirety. You should also refer
to the Troubleshooting chapter for basic theory of operations
information.
Hot Issues Mixed Memory Types - 2

Mixed Memory Types
The iMac computer uses SDRAM SO-DIMMs only; EDO
memory will not work in the iMac computer. System
problems will result if EDO memory is installed. (See
"SDRAM DIMMs" in the Basics chapter and refer to the iMac
section of the Memory Guide.)

Note: Customers are allowed to upgrade the memory in
iMac computers and may inadvertently mix EDO and SDRAM
memory. If incompatible memory types are installed, you
will hear two beeps upon startup. (See "Power-On Self
Test" in Troubleshooting for more information.)
Hot Issues Mixed Memory Types - 3

SGRAM Video Memory
The iMac computers use SGRAM video memory. Use only
SGRAM SO-DIMMs in these machines. Never install the
256K or 512K video memory DIMMs used in older
Macintosh computers. (See "SGRAM Video Memory" in the
Basics chapter.)

Error Beeps
If problems are detected upon startup, the iMac system will
sound one or more error beeps. (See "Error Beeps" in the
Troubleshooting chapter.)
Hot Issues HFS Plus Formatted Drives - 4

HFS Plus Formatted Drives
The iMac hard drive is formatted from the factory with Mac
OS Extended format, also referred to as HFS Plus. Norton
Utilities version 3.5 is not compatible with HFS Plus and
version 3.5.1 and earlier can result in hard drive
corruption and loss of all data on the hard drive. (See "HFS
Plus Formatted Drives" in the Troubleshooting chapter.)
Hot Issues Forcing a Restart - 5

Forcing a Restart
If holding down the Command, Control, and Power keys fails
to restart the iMac computer after a system hang, you can
force a restart in one of two ways:

First, try inserting a straightened paper clip in the reset
button hole. (Open the I/O door on the side of the iMac. The
reset button hole is the top hole located between the Ethernet
and modem ports and marked with a triangle symbol.)

If the reset button method doesn't work, try the following:
1. Unplug the power cord.
2. Wait at least 30 seconds and then reconnect the power
cord.
3. Restart the iMac by pressing the power button on either
the keyboard or the front of the computer.
Hot Issues External Displays Not Supported - 6

External Displays Not Supported
Connecting an external display to the iMac is not supported by
Apple. The db-15 port on the iMac was not designed to support
an external monitor. Apple designed iMac with a very sharp,
15-inch internal display and no video-out port to connect a
second display.

Refer to Tech Info Library (TIL) article #43016, "iMac: Can I
Attach an External Display?" for more information.
Hot Issues iMac Updates - 7

iMac Updates
Apple has released a number of updates for the iMac. Refer to
TIL article #58174, iMac: When to Install Available
Updaters. This TIL article will clarify when to use the
available updates depending upon which version of iMac you
have.

Additional iMac Update articles: