> On 10 Dec. 2016, at 8:57 pm, Alan Smith <[email protected]> wrote: > > How can I find readings (and adjust) the fan speed of my late 2012 27inch > fusion drive iMac? Is there data log of fan history? > > Mac failed yesterday and today. Restarted OK after say 20 minutes after > trying different power point, cable, etc. Mac case was cool to touch but I > don't recall any fan sound at all.
Hello Alan, Require more information as to what you mean by “Mac Failed”? What happens… does it just shutdown when you are working in a particular program or does the iMac shut down randomly with no apparent reason? I guess you have tried SMC reset on your iMac - restart unplug power line for 30 seconds, (reset SMC). Have you run the Hardware Test? Could be a faulty 'Power unit’ or Logic board. If it came with Lion or later, follow these instructions: Carefully read and follow the instructions, running AHT on a 2012 iMac is pretty straightforward. <http://support.apple.com/kb/HT1509 <http://support.apple.com/kb/HT1509>> 1. Turn off the iMac and then start it again while holding down D I find iStat Menus very useful monitor. iStat Menus lets you monitor your system right from the menubar. Included are 8 menu extras that let you monitor every aspect of your system. iStat Menus 5.31 iStat Menus help control the speed of fans in your Mac. NOTE: that fans are always controlled by the System Management Controller (SMC) in your Mac — iStat Menus simply asks the system to increase the lowest fan speed. It can’t lower fans below the speed the SMC would normally use. https://bjango.com/mac/istatmenus/ <https://bjango.com/mac/istatmenus/> Cheers, Ronni 13-inch MacBook Air (April 2014) 1.7GHz Dual-Core Intel Core i7, Turbo Boost to 3.3GHz 8GB 1600MHz LPDDR3 SDRAM 512GB PCIe-based Flash Storage macOS Sierra 10.12.1 > > Regards > Alan Smith > > Sent from my iPad
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