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You need to reposition (clip) the torssion bar under the spacebar key (a steel wire formed in a wide U shape), it is unhooked, call for a professionnal if you'r not sure how to do this as you may brake the plastic hinge if you don't know what you'r dooing...
Pull the space bar off by using your fingers. Underneath, you'll find a metal rod. Take note on which way it is facing, and how it fits. Make sure nothing in broken under the space bar, then put the space bar back on making sure it hooks in correctly.
Of all the keys on the keyboard, replacing the SPACEBAR is probably the most difficult. The SPACEBAR is kept even by a metal wire that is inserted into slots on each leg of the plastic bar key. However, you have to get the wire into the slots without depressing the wire. If you push the wire down, you compress the wire and installation becomes impossible. As a general rule, do not remove the SPACEBAR unless absolutely necessary. If you remove the SPACEBAR, remove several surrounding key caps also. This will let you get some tools under the SPACEBAR wire later on. Once the SPACEBAR is reinserted, you can easily replace any of the other key caps.
There is a rubber part that is designed to spring up when you release the space bar - this is the contacts that is the electrical push button. At each end the metal bar is hooked to the plastic (the long space bar key). There may be a couple springs found as well - they should seat on the base. Connect all pieces and place the space bar key over the area where it aligns to the keyboard and snap it place with a slight force.
The spacebar is the most often used switch on your keyboard, so, yes, it's from overuse, but also from the fact that it is the longest key on your keyboard and the closest to the edge, all of this combining to make it the dirtiest key on the board.
So, get a keyboard cleaning kit, either professional or DIY which would consist of the following, cotton swabs, compressed air, and maybe a toothbrush and realize that all the stuff that accumulates under your keyboard's space key makes it harder to depress to the point where contact is made.
Take the wire piece out of the keyboard and attach it to the space bar by snapping the long horizontal section into the notched moldings you will see along one edge of the underside of the spacebar. Now turn the spacebar back over, orient it with the high side toward you and the lower side toward the other keys, fit the retainer ends into the slots in the keyboard, and push the spacebar center pin back into its hole. The wire is not really a retainer; it is there to transfer to the center pin any pressure applied to either end of the bar.
Have you tried applying pressure gently until it snaps back in place? That could be the issue, is that the spacebar unsnapped itself when you were cleaning it. If you were using compressed air (canned air) then you may have blown something underneath it and it jammed itself in there. Trying turning the keyboard upside down and gently tapping it on a hard surface to see if anything else comes out.
the prongs of the floating plastic frame need to sit inside the clips of the spacebar key, you can't just clip it back on with the prongs either up or down. It's fiddly, you need a paperclip or thin screwdriver to do it, but it's stopped the sticking problem.