If your replacement trackpad comes with the cable separated and loose, the connection to the trackpad needs to have a tab pressed down which keeps the connection snug. It won't work without it. It's a tab on the trackpad part of the connection. Tab might be the wrong word; the connection has to be in all the way, then clamp it closed with the tab... oops! LOL

Mine was stuck to the Keyboard Ribbon Cable; needed an extra pull, but it's safe and should come off - it's not attached to anything. :)

I don't have a magnetic head driver so I had a terrible time trying to get the screws in. I found getting the screw on the table Phillips side up, I pushed my finger tip into the head til it stuck and placed the screw into the thread that way. The screw stayed in long enough for me to tighten with the driver ! Oh, what a relief! I only lost one screw; thank god for replacement screws! Order your trackpad with screws! They fall and get lost easy! Now I'm happy! :)

I was afraid to pull too hard, but wiggling it worked! :)