IMac 27 5k (late 2014) fan runs low speed nonstop during sleep mode

Hi,
New to the Mac community. Had the iMac 27 5K for about a month now. I've noticed the fan in the back of the monitor runs on low the entire time it's in Sleep Mode. I need to put my ear up to the vent to hear the fan running but can definitely feel air blowing out of it even after it's been sleeping for a few hours. It runs on low throughout the night. The fan stops completely only when it's shut down. Since this is my first iMac, not sure if this is normal or not? Can anyone confirm or have the same occurrence? Thanks for your input.

UPDATE:
For anyone with the same issue with this model of iMac; the fan running on low when it's in sleep mode is NOT NORMAL. I eventually brought the computer into an Apple store. They ran diagnostics and nothing. This model being so new has not had many logged issues in their database. They were going to reinstall the OS but after I reiterated that the fan runs all throughout the night while in sleep mode they decided to exchange it for another new computer. As an aside I noticed a large spike in my electricity bill in the month I've had the iMac hence noticing the fan ran all the time while in sleep mode. Otherwise, I wouldn't have look into it as an issue. I'm pleased to say that with the new computer, when I put it into sleep mode, the fan stops. Hope this helps others who run into this problem.

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This question was solved.
View Solution.

Hello mpw101,
Seems like there was some confusion on the products your received and how it was explained. I have forwarded your thread to the appropriate team for review. Someone should be in contact with you shortly so you can discuss your HP customer care experience.
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Im just wondering if this hard drive accessing / clicking noise during sleep mode is normal in imacs?
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Hey, thanks for the response.
The "Startup after power failure" option was not checked.
I'll try the Extended Hardware test when I get some spare time again - probably tomorrow night. After that I suppose it is time to either take it in for service/diagnosis, or just keep using Windows to shut it down. Sleep mode is unfortunately not an option because it eventually goes into hibernate state, which has the same problem as turning off. I don't like to leave the computer on all night, just from a power-conscious point of view (but yes, I know today's iMacs use very little power). I have it on a power bar now, so I just flick the switch off when I power down. It's not bad as a temporary solution - perhaps permanent if the shop says they have to replace the motherboard.
As for contacting Apple... I had a 1-hour conversation with them about my iCloud account, because it suddenly stopped working on this Forum site (hence the new account with no points). Anytime I sign in, it forwards me to the "page not found" error page. This happens even if I sign in on the apple store then click over to here. If my login info has an open session, then Discussions just doesn't work. They were completely baffled (understandably), because the account works on iTunes, iCloud.com, Apple store, and everywhere except Discussions. I was on the phone with them for over an hour - and the kicker is, even after telling them the same thing happens in other browsers, from other computers, they actually forwarded me to the iMac team. This is when I lost faith in Apple support. When one of the staff asked why I don't just phone about the issue, instead of trying to get access to the forums just to post about it, I told them I didn't want to pay $50/hr (or whatever the insane rate is for Mac hardware issues), only to be put on hold and sent around between departments, just to be told I need to send it in for service, which I'm probably not going to do if it's the motherboard. They never did get back to me about my account issue...
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Mac model
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Windows Vista
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Windows XP
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Hi there - wondered if you got an answer to your question as I have the exact same question.
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IMac 27 5k (late 2014) fan runs low speed nonstop during sleep mode

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