Chosen Solution

It happened out of the blue for no specific reason, the key is intact but I can’t seem to figure out how to put it back on! As it shows on the linked picture, the upper part of the plastic thingy won’t go down. http://imgur.com/a/Uchqb Please, help if you can. Thanks!

Hi, Maybe this video can help you troubleshoot the problem: https://www.youtube.com/watch?v=kh88cn_r