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Helpful answers
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Dec 11, 2015 7:50 AM in response to liesbethuby rkaufmann87,Please read and follow the steps in If your Apple wireless mouse, keyboard, or trackpad aren't working as expected - Apple Support
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Dec 11, 2015 7:55 AM in response to liesbethuby Duane,If your hard drive is full, the Mac OS can not operate correctly. The Mac OS constantly writes bit of information and caches to the hard drive.
You should try booting into recovery mode and then moving some files off your hard drive. OS X: About OS X Recovery - Apple Support
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Dec 11, 2015 7:57 AM in response to liesbethuby babowa,Your hard drive needs empty space to operate - so you should never let it get that far; maintain an absolute 10 - 15 GB empty space at all times. If you do a lot of video editing, you should maintain at least as much empty space as you have temporary files in your project (which can add up to 100 - 150 GB in a one hour HD video) so it cen render properly.
You didn't provide any usable information (model/year, Mac OS version), so these are general suggestions. If you have a bootable clone, boot from it, try to access your hard drive, and move - and then delete - some space hogging files (don't forget to empty trash). If not, then boot into recovery, plug in an external drive, access your internal drive if possible, and drag files onto the external drive, then delete them. You need to delete at least 10 - 20 GB. After that, try to boot into your normal system again.
Remember that your hard drive is more than a storage device: it contains your OS and needs space to read/write continuously.