My keyboard works, but was taken over by the stranger.

Almost every day, my system will sometimes, berzerk.  The characters I type will take 10 seconds, either on the search box tab url, it will offer several different options for a letter I typed in languages I've ever seen.  It may take 2 or 3 reboots to rework.  Also, when I type something in my password, it will simply type dozens of characters willy nilly.  It's driving me crazy.  Any ideas?

Model name: iMac

Model identifier: iMac14, 1

Processor name: Intel Core i5

Processor speed: 2.7 GHz

Number of processors: 1

Total number of Cores: 4

(By heart) L2 Cache: 256 KB

L3 Cache: 4 MB

Memory: 16 GB

I use El Capitan 10.11.1

Post edited by: linda282

It may be better to try to reinstall

How to reinstall OS X on your Mac - Apple Support

Tags: Mac

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