Thank you! This is a first time repair for me, and it worked!

As for step 8, my Gateway W350I has a cable retainer. The first time I tried the repair, the keyboard wouldn't work. Sure enough, the cable got loose after I tried putting it in. On the second attempt (after some research on my phone), I carefully nudged the tabs on the retainer 2 mm away from the connector, put the cable in, and nudged the tabs back into the connector. After the cable was locked, the keyboard worked perfectly.