One key fell off

It should be placed behind the catch (button). If the button retainers are not broken off, just place it under the catch and snap it back into place.

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A key falling off of a keyboard might be an annoyance, but it is not a reason to buy a new keyboard. Regardless of which key falls off, it can be replaced fairly easily. Although the method of replacing typical letter keys is a little different than replacing the space bar, replacing either of these types of keys can be done in a few minutes.

Carefully pry the key from the keyboard next to the key that has fallen off. This key can easily be pried by sliding a flat-head screwdriver underneath it and popping the key out. Be careful to make sure the key retainer underneath the key stays in place, especially if the key retainer has also fallen off the key you are attempting to fix. Look closely at the key retainer underneath the key that was just removed. Notice there is a notch in each corner of the key designed to hold the key in place. Place the key retainer back into place if it has fallen off the key you are trying to fix. Make sure it is positioned exactly as the key retainer next to it is. Put the key on top of the key retainer. Use your index finger to firmly push straight down on the key to lock the key back into place. Do the same to the key that was taken off to view the other key retainer. b> Replacing the Space Bar b> Turn the space bar upside down and use a flat-head screwdriver to separate the retainer from the back of the space bar key. Place the retainer into its place on the keyboard. The retainer will hook into small hooks on the left and right sides. The small metal bar from the retainer should line the bottom of the area where the space bar will be placed. Put the space bar back into the place where it belongs. Spread the ring finger, middle finger and index finger across the space bar, and push firmly until the key snaps into place. Put the space bar key back in place and gently press on it with fingers until it snaps back in place.

b>

Turn your laptop off, then use a flathead screwdriver or knife under a key corner, prying the key off gently.

You will hear a snap as the key detaches.

Remove the key retainer remaining on your laptop using your knife or screwdriver under the corner, then popping it off with a gentle twist.

Remove the space bar by pulling it off after your insert the screwdriver or knife underneath the bar.

Clean underneath your laptop keys using cotton swabs or a soft cloth dampened with water or alcohol.

You can also use compressed air to remove dust, hair and other debris.

Replace your laptop keys by placing the key retainer into position.

If you cannot remember the position, copy another retainer's position by removing another key.

Insert the keypad into the retainer, then position the key over the retainer while pressing down on the key.

You should hear the key snap into place.

Place your laptop's space bar over the space bar slots, then snap it into place

Hope this helps.

Hello and welcome to FixYa,

Carefully remove the cap from any other working key so the key retainer stays connected to the keyboard.
Take a closer look at the key retainer, it's connected to the keyboard at four different points. Assemble the disconnected retainer the same way as one on the keyboard and put it back in place. Put the key cap on the retainer and snap the cap back in place.

It is that simple! They should just 'snap' right back on!

Let me know how this worked out for you. If my solution helped you, please rate this solution!
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Set aside the key and retainer that have fallen off. If you lost the key, retainer, or both, you will have to order a replacement from the computer's manufacturer. As an alternate, you may be able to get a replacement from someone who has a non-working laptop of the same model as your own.Carefully pop off another key from your laptop. Choose one that you don't use frequently, and remove it with care so its retainer stays in the proper place. You will be using it as a model for your repair.

Note how the exposed retainer is connected to the keyboard. It will probably be connected at four separate points. This may vary, based on the make and model of your specific laptop. Study it until you feel confident replacing the retainer in the correct manner. Replace the retainer that popped off your laptop. Once you have it secured in place, pop the missing key onto it. The key should snap firmly into place onto the retainer. Replace the key cap on the retainer that you used as your model. Like the other key, it should snap firmly into place, and both keys should now be ready for use.

The space bar key is connected tothe keyboard a little bit differently then any other key.

There is a metal retainer connectedto the space bar key (on some keyboard models). Separate the retainer from thespace bar key with a flathead screwdriver.

Install the retainer back inplace as it shown on the picture. You have to engage the retainer with thesmall hooks on the keyboard.

Put the space bar key back inplace and gently press on it with fingers until it snaps back in place.

That’s it. The space bar key isinstalled back in place and should work as before. If you still cannot fix yourkeyboard, then you’ll have to find a new oneand replace it.
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Yes it does snap back on. Place it where it on top of the retainer and press down gently until it snaps into place. You may need to work it around a bit in order to line it up. If it doesn't snap on or doesn't stay, check the bottom of the key to make sure the sides where the retainer goes into hasn't collapsed, or check the retainer to see if one of the pins that snaps into the key isn't bent or broken. If the sides are collapsed or a pin is bent, you can bend the side or pin back into place with a small screwdriver, be gentle as not to break it. If it's broken it will need to be replaced.

Situation 1. The key cap and key retainer fell off the keyboard and you cannot figure out how to assemble them back. Carefully remove the cap from any other working key so the key retainer stays connected to the keyboard.
Take a closer look at the key retainer, it’s connected to the keyboard at four different points. Assemble the disconnected retainer the same way as one on the keyboard and put it back in place. Put the key cap on the retainer and snap the cap back in place.

1.
If you have the key retainer (image) you can find some good instructions on the webpage.

2.
If you do not have the retainer you will have to buy either the key or the entire keyboard from ebay. As of Jan 1 there are no keys available for acer keyboards but the entire keyboard is available here and here.