that means 24 imac has a flashing envelope with exclamation mark mean?

What model of imac 24 A1225 a flashing envelope with exclamation mark mean? I try to install snow leopard. I inserted the disc, but nothing happens.

This means that no boot drive cannot be found.

Insert the Snow Leopard DVD and restart the machine while holding down the c key and follow the instructions.

Tags: Mac OS & System Software

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