IMac opens , the screen becomes grey, the apple appears then the little wheel and then the iMac shuts off ?

When I open my iMac(white) it starts the screen becomes grey, the apple appears then the little wheel end, then it stops, switch off.

Hello,
Feel free to start a new question to get he most helpers in on it...
https://discussions.apple.com/community/desktop_computers/imac_intel
But if it's an iMac, the exhaust slot that runs all along the top, open the RAM door, & the round fan intake in the lower back behind the stand.

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