Kernel_task using 300% CPU time, high fan speed and slow computer in MacBook Pro [duplicate]
Check this solution from macrumors:
- Go to About this mac under the apple in the upper left and click on More info
- Click on system report
- Make a note of what it says after Model Identifier
- Go to the folder (this can be achieved in Finder using Go>Go to Folder (cmd-shift-g) )
/System/Library/Extensions/IOPlatformPluginFamily.kext/Contents/Plugins/ACPI_SMC_PlatformPlugin.kext/Contents/Resources - Find the name from step 3 and move it to a folder that you can find again if needed.
- Restart and you’re done
Re-install OS X system using a Time Machine backup
The easy way is to reinstall OS X and restore using a Time Machine backup.
First make shure you have a Time Machine backup.
Time Machine works with any hard disk connected to your computer using USB, FireWire or Thunderbolt.
- Select the Time Machine icon from the Menu.
- Select Open Time Machine Preferences...
- If Time Machine is off, set the slider to on.
- Select the disk you want to use as a Time Machine backup.
- Time Machine will set the hard drive up for backups and will automatically start the first backup within two minutes.
Use these steps if you need to erase a disk before installing OS X:
- Before you begin, you need to be connected to the Internet.
- Choose Apple menu > Restart, and then hold down the Command (⌘) and R keys while the computer restarts.
- Select “Disk Utility,” and then click Continue. Select your startup disk from the list on the left, and then click the Erase tab.
- From the Format pop-up menu, select Mac OS Extended (Journaled), type a name for your disk, and then click Erase.
- After the disk has been erased, choose Disk Utility > Quit Disk Utility.
- If you’re not connected to the Internet, choose a network from the Wi-Fi menu in the right corner of the menu bar (in the top-right corner of the screen). Select Reinstall Mac OS X, click Continue, and then follow the instructions.
To restore the complete contents of your hard drive from a Time Machine backup:
- Power up your Mac and hold down the command and R keys to enter the Recovery Partition. Your Mac should boot to a screen that says OS X Utilities.
- Select Restore from Time Machine Backup and click Continue.
- Read the info on the Restore Your System page and click Continue.
- Select your Time Machine backup and click Continue.
- Select the most recent backup of your hard disk and click Continue. Your Mac will then restore the Time Machine backup; once it's done it will restart.
iMore apple.com