Clicking/Ticking noise while iMac is sleep mode or turned off?!

I use an iMac and the problem is with the noise that I get while using it. I do not know what could have been the reason for the same. I get a noise of clicking or ticking while the system is under sleep mode or turned off. i do not know what could have been the issue. Please help me out so that I can make the necessary change. So do help me out. Thank you.

It would be better if you get the issue sorted by taking the device to the Apple support. They will definitely help you out to make the certain implementation to work out. So do check for the issue and make the certain changes. This should help you out well and process for you. So do look out and perform as needed. I hope this may solve.

Seems like some hardware issue that you are facing. So in order to get the issue sorted it is necessary that you perform a task which you can make the process well. All you need to do is to look for the hardware issue and can be checked under Apple support. I hope this is the best way through which you can work out well.

I suppose the problem could be with the device or system. Try reinstalling the operating system. If that do not help I would suggest you to make the issue sorted by replacing the device from Apple. This will help you out well for making the necessary change as required. So do look out and perform for the thing. I hope this will help and make you to function as needed.