Never happened before, turned on my iMac this morning and it's making a very loud noise, seems to be the fan and it's a freezing cold morning, so I don't know why it's going off like crazy? Any ideas please? 
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iMac fan going full blast, why?
- Thread starter 2012Tony2012
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Have you tried to restart it and if so does the fan continue still?
Have you made any hardware changes to the computer recently?
Have you made any hardware changes to the computer recently?
Yeah i've got the same issue. Yeah I've just upgraded the graphics card, but I've also done the SMC reset a few times but hasn't worked, so would love to know what the fix is. Thanks
Which iMac do you have? Did you happen to remove your hard drive or SSD and to put it back? Did you forget to reconnect any connections?