My MacBook Pro fans act normal and speed up when it gets hot. The thing is that the iMac fans never speed up at all and it overheats and will shutdown eventually. I make sure that I observe ESD practices with ground straps. If any of my Macs get dirty inside I'll carefully take them apart and vacuum and blow out the filth. I was just checking, not many folks think to even clean the dust off the intake grills regularly must less the insides. And I have had it apart to change the hard disk and there was only a small amount of very fine dust to clean out and nothing more. I'm also using Fan Control on my 2010 Mac Mini in hopes that it too will last as long or longer than my iMac.īut if you must know it's very clean inside and operates in a house that has high end air purifiers and is nearly dust free. I am with you and also believe that cooler hardware will last longer.! That's why I've been using SMCFanControl on my 2006 iMac for over 6 years, which seems to have paid off. Problem is, that eventually it comes at a price and after a few years (5+ in your case) the hardware begins to suffer. I'm not sure why Apple has the thresholds set up so high, perhaps to maintain a quieter all-in-one system than it's competitors. This doesn't address the problem of the fans not speeding up when it's hot at all. Why can this control panel speed up and control the fans just fine and effectively cool the iMac but left to it's default control it does nothing and allows the iMac to overheat? And has anyone had this problem and found a way to fix it? Many people seem to like SmcFanControl for some reason but I don't because it's crude and totally manual in setting the base fan speed which keeps the fan running higher than normal all the time but doesn't help much to cool if the iMac gets really hot unless you manually speed up the fan more. The one I chose as the best was Derman's version of Fan Control, a control panel which is automatic and effectively keeps all the temperatures normal and has been my solution to the problem. Then I found some of these apps that let you control the fan speed manually or customize the threshold and with some of these I was able to speed the fans up. It was a while before I had installed software that measured temperatures of devices or fan speeds inside the iMac and then determine what was happening and that indeed the iMac would shut off when the power supply got too hot. I have a 2007 iMac that for some reason the fans won't speed up above idle and so if it's put to heavy use eventually it will overheat and shutdown.
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