Since yesterday ( I got my laptop in July) my laptop keyboard behave in a weird way: Just from start it activates "n" key without even pressing it! And that fact don't let me do nothing in the system. Its a annoying failure because i cant type anithing since then.
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You will need to replace the keyboard, but since there is a mouse problem also, I recommend the laptop be checked for motherboard damage by a computer repair shop. What ever moisture got in will need to be cleaned up.
There is not so much that could be done to repair a keyboard. Disassemble the laptop, check the ribbon cable connecting the keyboard to the motherboard. If the ribbon cable is loose, tighten it. If it is tight, replace the keyboard with a new one.
This is usually caused by the FN LOCK key being stuck. You probably also have the U, I, J and K keys behaving funny and believing they're a numeric keypad.
Try clicking two or three times both shift, the FN key, NumLock key and, just in case, the Ctrl key. Also try pressing Alt-O and Alt-M or Fn-O or Fn-Alt-O and see if that gets you back the "O" key.
If only the M and O keys behave this way, though, it looks more like a keyboard driver problem; reinstalling the driver (or selecting a different keyboard, such as French one, and then back the normal keyboard again) might fix it.
You probably activated the "Num Lock" accidently. Just hold down the FN and look for the key that says "num lock" Now you should have your keyboard back and the numbers will just type when you hit the numbers key. I did this to myself yesterday!
To start you can temporarily use an external USB corded keyboard, do not use a wireless keyboard, a corded usb keyboard won't require drivers, and you can access the system straigh away. You can buy a wired usb keyboard at any computer shop for $20/$30.
After you access to your system using your external keyboard, do a backup of your data, and have laptop internal keyboard replaced. The spare is not expensive, but the job should be done by a technician, here is the replacement part:
Laptop keyboard replacement for Dell Inspiron E1405