When I turn on my iMac, instead of the normal opening screen I get an image of a gray file with a question mark in it flashing. What is is? mark

When I start my iMac, instead of the regular start up screen I get an image of a gray file folder with a question mark in it. The image is flashing. What is this? mark

Unishape, you'll need to get out you're install discs that came with your Mac. See this article for help
https://support.apple.com/kb/TS1440

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