User Guide

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.)