IMac, 10.9.4., spacebar "clicked" by itself.

I have a 21.5-inch iMac, Mid 2010 with 10.9.4. After performing the latest OS update, the spacebar seems to be pressed by itself whether I have a keyboard connected or not. This means that the spacebar stays pressed at all times. I have verified this using the keyboard viewer where it shows the spacebar pressed at all times. I have bought a new keyboard and I have even deleted my partition and reinstalled the Mavericks but it still functions the same way. Please advise.
Thanks in advance

I had unpaired the old keyboard. And that was exactly what I was getting.
I found a solution and it was, in fact, to disconnect, surprisingly, the mouse. I was using a random 5$ mouse, which, for some reason forced the spacebar to be clicked. I have no idea how that happened, but as soon as I disconnected it, it stopped happening. I replaced it with another mouse and all worked just fine.
Thanks anyway.

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This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
The purpose of this exercise is to determine whether the problem is caused by third-party system modifications that load automatically at startup or login. Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards. Boot in safe mode* and log in to the account with the problem. The instructions provided by Apple are as follows:
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IMac, 10.9.4., spacebar "clicked" by itself.

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