Okay, this is a little out there but was suggested by a Macworld reader in the US. We’ve heard of cases of both – the latter in particular when you are using your iMac to watch a lot of HD movies. It’s possible, for instance, that you need to replace a component such as a hard drive or GPU. And depending on your DIY chops you may need to have that guy on speed dial to fix the underlying problem. Failing that a Mac repair professional definitely will. A Google Search of those codes should tell you of any hardware problems your iMac has. Run it and note down any codes it gives you. Simply start up from your system installation disk or a secondary hard disk while holding down the “D” key until the AHT starts up. To find out where the problem is you want to run theĪpple Hardware Test. It’s possible that a component has failed or is failing and the fans are working harder to try – unsuccessfully – to cover this up. That means your problem is likely a hardware issue. You can uninstall the program once you are happy. So install and run a freeĪvast Free Antivirus for Mac, scan your iMac and rule out the possibility of an infection. That is much less likely with an OS X system, of course, but it is a possibility. If this was a Windows PC we’d immediately suggest that the problem is likely to be a virus. Fix overheating iMac: what is the problem? More importantly increasing the work of your existing fans will wear them out more quickly and may mask an underlying hardware fault that is causing the problem. For one thing increased fan use leads to increased noise. See if that helps – you can always increase the fan’s work further. In the event described above in which your iMac has overheated and shut down we recommend setting a minimum fan speeds of 2800rpm for the CPU and 2200rpm for the hard drive.
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