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Several days ago, my computer has developed a problem. At seemingly random times of day it will stop responding to key presses. It can sometimes take up to 5 seconds for the computer to respond to input when this is happening but I can move the mouse and click without trouble. It is not limited to specific applications and it even blocks shortcut keys such as Windows-D

How can I find the cause of this problem? Could it be a running process that is blocking keyboard input?

Dell Precision LAPTOP, running Windows 7.

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Whats a stroke touch/strike touch? does the keyboard freeze totally? – Journeyman Geek Jun 4 '12 at 10:54
yes ! during 5s or less – Florian Jun 4 '12 at 11:00
When you press a key? (what key? Any key?) 5s before or after what? – Journeyman Geek Jun 4 '12 at 11:15
when I press any key. (letter, figures, shift, capslock...) for example : for the precedent 'example' word, I strike 'e' 'x' but nothing displayed... Then after 2s I retry and stroke 'e' 'x' 'a' 'm' 'p' 'l'... and it works. – Florian Jun 4 '12 at 11:18
Each time or randomly? Like if you tried to type something after that does it freeze again? – Journeyman Geek Jun 4 '12 at 11:25

You may have a program running that is intercepting keyboard strokes when you press a key.

You should run a full system scan according to the directions in this community-approved virus detection and removal wiki and make sure there are no unauthorized programs running on your computer.

I experience a similar problem due to a screen dimming program that runs in the background. During certain times of the day when it is adjusting the screen, I cannot type.

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