My Mac’s fans are stuck on full blast!

Mac Format - - GENIUS TIPS - by Des Daughton

Safe mode turns off third-party ex­ten­sions, which should tell you if one of them is to blame

QMy iMac (27-inch, Mid 2010) started crash­ing when asleep, and now its in­ter­nal fans are stuck blow­ing at full speed, even af­ter re­set­ting its SMC. What’s wrong with it?

AShut down your iMac, leave it to cool off for 10 min­utes, then start it up in Ap­ple Hard­ware Test (see ap­ple.co/ 2b3FhpK for instructions on how to ac­cess that; you may need the in­stall discs that came with your Mac). If that tool’s test re­sults check out as nor­mal and your Mac’s fans stay full on, re­set the SMC and then its NVRAM (see the box be­low for instructions).

You may need to cor­rect set­tings such as vol­ume and dis­play af­ter­wards, but the fans should drop back to nor­mal. If not, take your iMac to a Ge­nius Bar for a com­plete check-up. Fur­ther crashes dur­ing sleep may dis­ap­pear in safe mode (hold ß at the startup sound); this turns off third-party ex­ten­sions, which should tell you if one of them is to blame.

Only one, TG Pro, gives you man­ual con­trol over fans, which can some­times help un­stick their au­to­matic con­trol.

Sev­eral util­i­ties such as Sys­tem Mon­i­tor can pro­vide use­ful in­for­ma­tion about in­ter­nal tem­per­a­tures and fan speeds.

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