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If you hear several beeps instead of the startup-chime - this is an error code:

1 one beep: There is no RAM installed
2 Two beeps: a EDO-RAM module installed The iBooks only works with SDRAM SO-DIMMS.
3 Three beeps: The built-in RAM / The extra RAM module have errors.
4 Four beeps: Checksum error in the boot-ROM.

If after the start a dialog box appears with the message: "Built-in memory test has detected an error"
try to remove the RAM in the slot located underneath the keyboard and restart. A "default catch!" Error and a boot into open firmware is caused by an incompatible RAM-Module.

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