Have an iMac. Problem is I hear the fan noise, yet no power on the screen yielding no power. I have checked the power cord and it seems to be fine. Not sure if computer is a total loss. What would be the next step?

Have an iMac. Problem is I hear the fan noise, yet no power on the screen yielding no power. I have checked the power cord and it seems to be fine. Not sure if computer is a total loss. What would be the next step?
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What does the EMC# say on the base?

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