In spite of all the obvious advice on holding down the quick selection tool, and resetting the tools, my dear old W-tool does not appear. What have I not tried yet?
The Magic Wand may be hidden. You can use the ellipses at the bottom of the toolbar, then reset your tools, but try this first:
Click the Search button (magnifying glass) in the upper right > type Magic Wand > confirm you are on the second tab for PS, and it will highlight the tool wherever it happens to be right now.