![]() Mac HDD Fan Control Fan Control Free Customize the way all of your fans behave in your Windows system. This detector has relatively sensitive connections, so even if properly seated in its socket during reassembly, it may have an improper connection that results in the fan blaring at high speeds since no feedback is present. Free to try Fixes issues with iMac fan noise after hard drive replacement. In order to get to the drive, one of the steps in disassembly is to remove a temperature sensor cable that provides feedback if the LCD display gets too hot. Recently the Mac-centric retailer and supply company "Other World Computing" outlined a potential issue where people upgrading their iMac's hard drives may simply have incorrectly reassembled a temperature feedback control when reassembling their systems. Some have speculated that the iMac may require special firmware from Apple in its hard drive to prevent the cooling fans from being maxed out however, this may also not be the issue at hand. Fixes issues with iMac fan noise after hard drive replacement. Apple iMac MK462LL/A 27' 8GB 3TB Core i5-6500 3.2GHz Mac OSX, Silver (Used - Blemished). HDD Fan Control will run the fan at the correct speed, and keep your drive cool and safe from overheating. The default/maximum settings for an ALU iMac are: ODD: 700/4400 HDD: 1200/5500 CPU: 1200/3300 When monitoring my iMac I found that it never once increased the fan speeds on it's own to adjust for an increase in temperature. Since the fan speeds and temperature feedback are managed by the Mac's system management controller (SMC), if this happens, the first course of action may be to attempt an SMC reset however, this may not fix the problem. Shop All Cooling Shop All Heating Fans Fireplaces Portable Air Conditioners Space Heaters Weatherproofing Window Air Conditioners.
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