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Blinking question mark when starting up

Everytime I open our iMac, there appears a blinking folder with a question mark. How will i fix it?

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That mean it can't find an OS or your HDD is bad. Run hardware diagnostics first.

Prob best to go to a repair shop unless your comfortable changing computer components and loading operating systems. They can also get the data off your old HDD.

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pickle - this is exactly what the guides are for: iMac Intel 17" Hard Drive Replacement

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