KeyBoard typing by itself

This is an old question but I had this happen to me and the answer was that I made a silly mistake. I have a Bluetooth keyboard that I connected to my Mac as a test. It worked fine.

The next day, my mac started typing things by itself. I rebooted, pulled the power and replugged it, etc. and assumed there was something wrong with my keyboard.

The problem turned out to be that my keys had fallen on the Bluetooth keyboard, which I had moved into a corner, and were resting on the space bar, which, of course, caused the problem. Maybe something similar is happening to you?

Hello,

One way to test is to Safe Boot from the HD, (holding Shift key down at bootup), run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions, Test for problem in Safe Mode...

PS. Safe boot may stay on the gray radian for a long time, let it go, it's trying to repair the Hard Drive

Reboot, test again.

If it only does it in Regular Boot, then it could be some hardware problem like Video card, (Quartz is turned off in Safe Mode), or Airport, or some USB or Firewire device, or 3rd party add-on, Check System Preferences>Accounts>Login Items window to see if it or something relevant is listed.

Check the System Preferences>Other Row, for 3rd party Pref Panes.

Also look in these if they exist, some are invisible...

/private/var/run/StartupItems

/Library/StartupItems

/System/Library/StartupItems

/System/Library/LaunchDaemons

/Library/LaunchDaemons

Besides what BDAqua suggests, might try a PRAM reset. Hold down Option(alt)-Cmd-P-R together at the startup chime, listen for two more chimes, total 3 and let go to finish booting. You may have to adjust the brightness back down afterward.

Haha, thanks for the report! 🙂