My imac turns on , the grey screen comes on and then within 5-10 secs. it shuts off. How can I fix this?

When I turn on my iMac, the grey screen comes on, the apple is there, the wheel turns and then it shust off.  How can I fix this?

sabaideedog wrote:
Do you have an answer?
We are all volunteer end users like yourself, so please be patient. Please Google OS X Gray Screen on Startup and read the Apple Advice letter on it. Follow all the steps in the advice letter to the letter.

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