"Home button does not "click"."に関する回答What you have to do is glue a small piece of plastic onto the gol/yellow dot that clicks.
"Screen replacement/home button,please HELP!"に関する回答I wouldn't try that only because your button is going to be pretty hard to press, and might not work at all, if you use that gasket. The iPhone 4 home button really isn't that difficult, use a splunger to gently peel underneath the ribbon where it first makes contact with the plastic. When connecting the pins use a pair of tweezers, they are a HUGE help. Hope that solves your issue.
"After doing DIY repair on iPhone it will not turn on."に関する回答Have him take a look at the battery connector to see if he accidentally lifted the pins off of the board itself, there are four pins and sometimes people will pry them off if they are in a rush or not extremely careful.