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I have a Mac Mini 1.1 on which I updated the EFI firmware to v2.1 and installed Mac OS X 10.7

I'm wondering how I can cool the Mac with an external fan somehow. I found the internal cooling to be slow, so I put an external handmade USB fan on the system in an open case and this works well for my purpose.

The problem with the external fan is that when I put the computer to sleep, the fan keeps on working and I don't know how to make it stop.

I don't want to use the system fan as it looks very weak and makes a lot of noise at 3000 rpm. I don't like noise.

  • Temps of 50-60C are normal for the C2 and C2D CPUs with normal loads.. The fan should kick in when nearing 70C – douggro Nov 23 '14 at 20:48
  • Those are 2 questions in one. Please separate them. – Ruskes Nov 23 '14 at 21:52
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To turn off the power to your "self made USB cooling fan" (nice one) you need to put the mac mini to hibernate mode not to sleep mode.

In Terminal (found in Applications -> Utilities) type

sudo pmset hibernatemode 1 
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To expand on the accepted answer, on some desktops, hibernatemode 1 is not available, see the manual page for what's available, go to terminal:

$ man pmset

(q to exit the man page, or esc, then q key)

Scroll way down to "SAFE SLEEP ARGUMENTS", it'll list which hibernatemode is available on your system, my old iMac says 0, 3, 25

I set it mine to 25 (write RAM contents to disk, then full power down). Originally devices like USB hubs won't power off when the system is in sleep mode, now it does.

However doing this will make sleeping and waking much slower. I'm still trying to see if I like this, now I close almost all open apps before putting system to sleep to minimize disk activity. Not totally sure if I like this, might be easier to unplug that USB hub.

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