Ctrl Keys suddenly not working

I have a Toshiba Satellite C855 where both Ctrl keys simply quit. Here's what I've tried so far.

I tried pressing Ctrl + Alt + Fn (Numerous websites suggested this for a Toshiba machine.)
I tried re-installing the keyboard drivers (by uninstalling the driver in the Device Manager and rebooting).
I tried rebooting in Safe Mode to determine if a particular app was causing the problem.

None of these steps fixed the issue.
jdanaAsked:
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JohnBusiness Consultant (Owner)Commented:
Can you try a different (USB) keyboard?  Given that you uninstalled and reinstalled the driver, it would seem to possibly be a keyboard error.

Check Accessibility (Control Panel) that you have not engaged accessibility features.
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jdanaAuthor Commented:
Thanks John,

Sure enough, the Ctrl key on an external USB keyboard worked. Since the driver re-install didn't fix the Ctrl key on internal keyboard AND the Ctrl key on the external keyboard did work, I'm thinking it's a hardware issue. Agreed? (The fact, however, that both Ctrl keys quit at the same time makes me a little skeptical that it's the hardware.) Your thoughts?

J
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JohnBusiness Consultant (Owner)Commented:
It would certainly be a hardware issue at this point based on the fact that a USB keyboard works. Ctrl is usually the same basic signal. Left Ctrl Alt Del is the same as Right Ctrl Alt Del. So it is probably some common circuitry.
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jdanaAuthor Commented:
Thanks John,

Sure appreciate the assistance.

J
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JohnBusiness Consultant (Owner)Commented:
@jdana  - You are very welcome and I was happy to help
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