imac(1).pdf

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Service Source
iMac
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Hot Issues
iMac
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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.
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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.)
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.)
Note:
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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.)
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