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i phone 4 screen wont come on but rings power top button dont work for months what are home and the other button they talk about?? top one power center ? center under screen home button? some say can use volume button?? what can I try/??? thanku

Home button is the only button at the bottom of the phone with the white square / circle. Power button is at the top left of the phone the button you use to turn the phone on, lock unlocking phone and turn phone off. If neither buttons work you need to turn assistive touch on under settings general accessibility. And you also need to keep screen turned on via auto lock off and if the phone gets locked you would need to plug it into a charger to switch the screen back on.