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<blockquote data-quote="Raz0rEdge" data-source="post: 1813973" data-attributes="member: 110816">In Safe Mode, the OS basically reduces the amount of things that run and is a great of isolating issues with apps. But it shouldn't necessarily lag or behave badly by itself.You should do a <a href="https://support.apple.com/en-us/HT204063" target="_blank">NVRAM/PRAM reset</a> and then run <a href="https://www.titanium-software.fr/en/onyx.html" target="_blank">OnyX</a> to just clean things up. Then do a <a href="https://support.apple.com/en-us/HT201560" target="_blank">disk repair</a> with Disk Utility. That should hopefully put the fan back to it's normal state and perhaps it will help with the Airport Utility crash. If not, one possible scenario is that your RAM might be going bad. Assuming you have 4x8GB sticks, reduce it down to 1 8GB and see if the crash happens. If not, continue to add additional RAM sticks until it happens. And when it does, operate the iMac on ONLY the perceived bad stick and see if it behaves very poorly, if so, you've found the culprit.</blockquote>

[QUOTE="Raz0rEdge, post: 1813973, member: 110816"] In Safe Mode, the OS basically reduces the amount of things that run and is a great of isolating issues with apps. But it shouldn't necessarily lag or behave badly by itself. You should do a [URL="https://support.apple.com/en-us/HT204063"]NVRAM/PRAM reset[/URL] and then run [URL="https://www.titanium-software.fr/en/onyx.html"]OnyX[/URL] to just clean things up. Then do a [URL="https://support.apple.com/en-us/HT201560"]disk repair[/URL] with Disk Utility. That should hopefully put the fan back to it's normal state and perhaps it will help with the Airport Utility crash. If not, one possible scenario is that your RAM might be going bad. Assuming you have 4x8GB sticks, reduce it down to 1 8GB and see if the crash happens. If not, continue to add additional RAM sticks until it happens. And when it does, operate the iMac on ONLY the perceived bad stick and see if it behaves very poorly, if so, you've found the culprit. [/QUOTE]

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