Reset pram mac mini mid 2011

Your unit should still be under warranty and I would take it to Apple and let them fix it for free. Just noticed you did a hard drive upgrade so Apple would probably not cover your problem.

Reset SMC of an iMac, Mac Pro, Mac Mini

Please go over the steps in your upgrade and see if you missed a sensor. I reassembled it after installation, and the fan went full blast, and wouldn't turn off. Sure enough, I forgot to reconnect the hard drive thermal sensor. Since there's no signal from the sensor, my guess is that it will default to full speed, for safety.

Zap the NVRAM (or PRAM)

Hope that helps. James Gordon. The "missing" componet is the thermal sensor, which is attached to the stock hard drive. When you take the stock hard drive out you will see that there are two connectors - the main hard drive connector and another, thinner connector. The wires for that thinner connector are stuck to the side of the hard drive with the plastic "cover".

A cursory glance will make you think those wires are just part of the hard drive, some superfluous connector that it appears you don't need, since the SSD works fine with just the main connector attached. They are not superfluous. And those wires don't actually go into the hard drive either. All you need to do is pull the plastic "cover" off and then gently peel off the sensor from the hard drive.

Then you can plug the sensor back in to the appropriate socket on the main board and run the sensor to somewhere where it might get hot. I just ran mine up near the RAM and now my fan works correctly. That's an amazing find! I was wondering what that extra lead on the old HD was all about.

When Should You Reset SMC?

Prayed it off and will attach to the new SSD. Hoping that will do the trick. Thanks for this tip; we had a mini with 2 HDs but didn't need them both. Pulled sensor off second drive and attached to the first only HD needed and worked like a charm. I assumed since I didn't have an optical or second HD that I wouldn't need the sensor in place One thing to check is the print manager. Sometimes the CPU gets stuck on trying to print to an unconnected printer.

I found that every time I want to my Mac mini 2. I killed the app and the fan slowed down with about a minute and within 2 mins all was quiet. Thanks for the tip Frank. I had this fan spin issue on my older core 2 duo mac mini, after installing an ssd. I solved this by replugging the fan in proper orientation.


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I must have turned it around during reinstallation. The issue for me was a tiny little wire that went into one of the sensors had come out just a bit, enough to break the connection. After using needle nose to slip it back up into the clip the fan worked fine.

It seems possible to swap the two accidentally. Good luck. I have resolved my fan issue.

Mac mini Mid 2011 PRAM Battery Replacement

A surface mount component had somehow come off the logic board and as a result the pwm fan control signal was not controlling the fan. The fan defaults to full speed when it sees no pwm signal. I was able to see the monitor signal was working by using smcfancontrol and the slowed the fan with my finger - the rpm changed. As a result the mac was requesting, for example, rpm, but as the fan didn't see the request it was giving approx.


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  • How, When, & Why to reset the PRAM & SMC on your Mac;
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  • The missing component was a bridging SMD device. By hooking up an oscilloscope I could see a pwm signal on one side of the missing bridge, but no signal at the fan. As soon as the 2 pads were bridged normal service resumed.

    How, When, & Why to reset the PRAM & SMC on your Mac

    Not sure how this component has become detached, presumably when I removed the fan connector. Anyway, it is worth checking for 2 solder pads just above the fan connector - if you see no component then you may have the same issue! I'm having the exact same problem but I don't have an oscilloscope. Thank you! Thank you AAC for the tip about the little smd component just next to the fan connector, somehow it got unsoldered and there was no contact, there are 3 components, and the one close to the fan connector was the issue.

    I checked with my multimeter and there was no connection, it seems to be a little diode or something because checking continuity after fix there was no resistance, one of the fan pins goes through it. Thank you again, also I had this SSD fan control application that did not work until I got this fixed. My board had 3 connector for the sensor's, 1 was for the hd temperature, DVD temperature, and 1 for ambient temperature.


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    • If you don't see 1 it is probably broken take a good picture of where the fan connector is at surrounding area, and I could point you where is it supposed to be. How can i solve this? This really helps. If the battery is nonremovable Shut down the Mac. Using the built-in keyboard, press Shift-Control-Option on the left side of the keyboard, then press the power button at the same time.

      Release all keys, then press the power button again to turn on your Mac If the battery is removable Shut down the Mac. Disconnect the MagSafe power adapter from the Mac. Remove the battery. Press and hold the power button for 5 seconds. Reconnect the battery and MagSafe power adapter. Press the power button to turn on the Mac. Shut down the Mac. Unplug the power cord. Wait 15 seconds. Plug the power cord back in.

      Resetting PRAM (MacMost Now 616)

      Wait 5 seconds, then press the power button to turn on the Mac. Tetsujin Tetsujin 64k 15 15 gold badges silver badges bronze badges. Medical School or Games Industry? Featured on Meta. Custom Filters release announcement. Shut down and unplug the Mac and remove any battery if you have access for at least thirty seconds before powering back on. Keep holding down all four keys until you hear the startup sound for a second time.

      Press and hold the power button for five seconds before releasing. Replace the battery just put it back in , plug in the Mac and turn it back on. Portable Macs without removable batteries Shut down the Mac. Ensure that the Mac is plugged into a power source. While the Mac is turned off, press and hold the Shift, Control and Option keys, as well as the Power button. Release all four keys at the same time note: the Mac should not power on when performing this task. Press the power button to turn the Mac back on. Keep the Mac unplugged for at least fifteen seconds.