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I have a Toshiba laptop running Windows 7.

For some reason I'm unable to type the letter Z or use any of the arrow keys. If I insert an external keyboard then it works fine.

What is wrong? How can I fix my laptop keyboard?

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The keyboard is broken. Most likely due to something spilled on it. Sometimes you can disassemble things and wash the keyboard to recover from this (I did a long post on this topic maybe a year back), but the odds are against it. – Daniel R Hicks Jan 3 '12 at 12:39

It could be that your laptop keyboard is broken, if an external keyboard is working okay.
Are the z and arrow keys feeling okay when you press them?
If they don't feel good you can be sure it is broken.

Changing a laptop keyboard is quite expensive, unless you have insurance.

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Yes, for the external keyboard it respond well. The problem is on the laptop keyboard only. – Ngorodinho Jan 3 '12 at 11:04
    
Did you wet the keyboard with coffee or something? Maybe somebody did and didn't tell you... – m0skit0 Jan 3 '12 at 11:13
    
Your laptop's keyboard is dead buddy. Take it to the service for change keyboard.. – Sencer H. Jan 3 '12 at 12:06
    
Thans for all, I will check all posibility before taking decionn of buying new one. – Ngorodinho Jan 4 '12 at 6:14

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