I didn't spill anything on my keyboard or anything like that, but all of a sudden I noticed my left and down arrow keys weren't responding. I tried the numlock, capslock, and Fn keys but it still doesn't work. The keys aren't stuck so I don't know what the problem is. Everything else works fine.
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Re: Arrow key problem
If its a sensor problem under the keyboard, gently blowing under the key or hoovering the keyboard may bring results, but it may just be the driver, so go to my comuter icon, right click, properties, the hardware tab, device manager and go down the list to keyboard, click the '+' sign to reveal your keyboard make, right click on it and select uninstal.
Restart the notebook and the keyboard will be recognised again and the driver automatically installed.
If none of that works your problem may be more serious in the way of a faulty circuit under the board
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This is caused by a short in the keyboard. Either something was spilled into the keyboard, or it was hit by a hard object.
Search EBay! for a replacement keyboard. Most of the time you can find them for $35-$50 and have a professional install it for you.
If you want to use the buttons on your keyboard to adjust your volume, just hold the "Fn" button just to the left of the windows key, and then push the "up" arrow or "down" arrow. To be clear, those are just the main arrow keys, up will turn the volume up, and down will turn it down (of course).
Your computer is in keypad mode. To check, turn off your Num Lock. On my system that disables the
embedded keypad. To fix, go into setup (usually F1, F2 or delete when booting). Somewhere you should find a setting for using the embedded keypad. Mine has two options, Fn Key Only and By Num Lock. Yours may be different. One activates the embedded keypad, which you are seeing. Try the other setting.
Disconnect the battery and a/c plug. Use a hair dryer on the keyboard for a while to try and dry it out. It may take a couple of days to dry out. If it continues to have problems your laptop may need a new keyboard or motherboard.