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Catherine, Try compressed air to blow dust and debris from key board, try a system restore to an earlier date, you could also try re installing key board/driver, you may also have faulty key board and need to replace..
Check the attached links,instruction and guides, Good luck
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info." Some Keyboard Keys not working Not all keys on keyboard work Some of my keyboard keys aren working
If this is a wired keyboard (USB or PS2) then turn off the computer. Unplug the keyboard, and bang it against your palm to work some of the debris out of the keyboard. Now check the d key and make sure it bounces back when pressed. You might also take a small screw driver and pry the d key off the key board and see if there is anything sticky on it. If so try cleaning with alcohol. Last ditch effort before replacing the keyboard completely: Run the key board under running water to rinse it. MAKE SURE YOU LET IT DRY FOR A COUPLE OF DAYS (KEYS DOWN) BEFORE PLUGGING BACK IN. I have had this method work more than once. If it works its great if not, then non of the key board will work.
The swapping process you have used already have clearly shown that your keyboard is faulty. It may be that a key is pressed down permanently / faulty and this blocks the signalling - check all the keys carefully to ensure none is depressed. Or one of the Connector pins (the part that goes into the computer) is bent - you may need to check and use a tool to straighten it.
But it is good to know that Keyboards are cheap to replace. If the above did not help, you can buy another keyboard for as low as £5 and then continue enjoying your computer.
Never been inside one of those keyboards but many keyboards have a printer circuit board with plastic film layers over the circuit board. There may still be juice trapped in the layers shorting out the key or you may have burned out the key when it shorted out. I've seen that many times on Microsoft keyboards. You can always take the keyboard apart and check out the 0 key.
if your laptop is outside warranty you can check the connection to the keyboard, by removing the top bezel, undoing the keyboard retaining screws and then check that the ribbon cable for your keyboard is seated properly, If reseating this cable does not work the you can always order a replacement for your keyboard, you can find the part number for the keyboard you have, it should be printed on a tag on the reverse of the keyboard.
Well if the sapce bar on the key board is not working.... you can try to use the keyboard on another system & see if the same key works if it still dosen't work.. then go ahead & replace the key board of your system..
When one key stops working in a Keyboard there is dirt or some other obstruction between the contact layers and the board needs to be dismantled and cleaned or the contact layer has been broken and the keyboard will not respond to that key any more. The first is more likely unless the board has been really abused.