i Mac fans hissing at start up
i Mac fans hissing at start up - - how to fix
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i Mac fans hissing at start up - - how to fix
What year model is this iMac?
see > Identify your iMac model - Apple Support
Have you tried resetting the iMac's SMC?
see > Reset the SMC of your Mac - Apple Support
Has any hardware ever been serviced, replaced or upgraded?
(a broken or disconnected temp. sensor can cause the fan(s) to run out of control)
What year model is this iMac?
see > Identify your iMac model - Apple Support
Have you tried resetting the iMac's SMC?
see > Reset the SMC of your Mac - Apple Support
Has any hardware ever been serviced, replaced or upgraded?
(a broken or disconnected temp. sensor can cause the fan(s) to run out of control)
Been hissing - fans for over an hour - - - -unplugged waited replugged in restart - - fans still hissing - - - stopped after about 45 min. Machine is less than 2 years old - - - machine is cool to the touch - - vents are NOT blocked - - - took small vacuum to vents last week - - - ??????
Do they stop soon after powering up?
Your air vents may be clogged; how old is the machine?
What's the fan speed? I use the app Fanny to display that. The fans run all the time; my 2020 iMac fan is running at 1200 rpm right now.
i Mac fans hissing at start up