Question about Compaq Presario 700 470024-192 Notebook

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One key from keyboard is continuously displays as if it is pressed continuously and some of the keys stops functioning.I tried to solve by replacing the keyboard into the port and it isn't solved.I have compaq C785tu series with windows XP installed.

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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

Posted on Sep 20, 2010

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Posted on Jan 02, 2017

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My key board with Dell Latitude laptop key board is not working. I purchased MK 250 wireless key board and conneted to TV for display The functional key for selecting the monitor is not there on the new...


The keyboard has a feature (and associated button) called F-Lock. By default, when the computer boots, F-Lock is turned on. In the F-Lock mode, rather than sending the standard key commands for the function keys, the keyboard sends special alternate commands (like print for F7 and save for F8) that are configured in the iTouch program. In order to force the keyboard to send the standard function key commands, you must TURN OFF F-Lock by pressing the F-Lock button! Oh, and by the way, there are no indicator lights on the keyboard, and the F-Lock button is an always up momentary button - just like the keys on the keyboard, so there is no way to tell what state it is in, other than by pressing it and then pressing an F key to see what happens!

This should solve your problem. Just turn off the F-Lock Mode.
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If this is hardware problem, it'd be hard to repair. I don't mean it's not repairable, but what i mean is i don't recommend since repairing a keyboard and purchasing a new item will cost you more or less the same.
Well try this, Press Fn + Numlock (simultaneously on both the keys) on the keyboard and check if it helps or not [press once and then type the malfunction keys, if not press twice or thrice]. Most keyboard with Fn key's functions can be deactivated or activated with this key combination.
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Sounds like the keyboard might be bad. Run your fingers thru the keys in a sweepting motion and see if that stops the keyboard from continously typing keys on the screen. If that doesn't do it then its time for a replacement keyboard.

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In laptops with a small screen (14,15" ) the keyboard is accordingly smaller than for desktops, and there is no numeric keypads, or arrow pad. So the keys 7,8,9 0, U,I,O,P,J,K,L ,comma, dot, / have a triple function: the primary function, the shifted function, and a third accessed by an FN-Fx key combination. The actual key combination may depend on manufacturer. If that key combination has been activated, the foregoing keys perfom the third function they were designed for..
Read your laptop manual to find out how the Fn- function key works and deactivate the Fn-Fx combination responsible for your keyboard behavior..(this article was posted by k24674)..

or else u r keyboard is likely to b defective or ur ram or the system board..
lightly strike/tap the keypad using ur hand..
if u r a professional, open the keyboard..deep clean all the carbon contacts beneath the keys using Iso-Propyl alcohol..put/stick 'Carbon-Dots' (available in cheap level spare market) as n where necessary..

hope it'll work..
always better to seek professional supervision esp of ur system admin/vendor....

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I finally solved the problem. In HP laptops some keys of the keyboard have two functions. I had accidentally change the function of those keys while cleaning the keyboard with a paint brush. So, I solved the problem by trial and error, pressing on the alt key, while pressing another key. I think it was the alt and the k, but i'm not sure. While pressing these two keys a light in the keyboard flashed and it made a sound, and the problem was solved.

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This message is usually accompanied by another more explicit, like: "Memory changed from 1GB to 2GB. Press F1 to continue". The message should display and go away after pressing F1. Since you cannot press F1 because the keys do nothing, chances are your keyboard is disconnected, which should display a message indicating this failure.
Try pressing the ScrLk (Scroll Lock) key as messages are being displayed to catch all
messages (they go by quickly) and stop them before they disappear.
If that's the case, then reconnect the keyboard and try again.
Good luck!

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It looks like you answered your own question - you really can't fix a laptop keyboard, but you can replace them. (or you can use an external keyboard)

Now is your problem:?
Letters qwert, asdfg, zxcvbn work OK but uiop displays as 456/ jkl displays as 123 and m displays as 0. Other keys also do not display correctly. Or holding the function key down at the same time as the problem keys ?

Then the solution is:
The problem was caused by accidentally pressing the num lock key. Once pressed, it remains locked even after a reboot. Pressing again returns the keyboard to normal.

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