It wont turn on

we found my moms old game gear in are garage i put in super space invaders and new batterys in we only have one of those case things and the metal parts have white stuff on them when i took the old batteryes out of it helps

crwdns2893858:0crwdne2893858:0 crwdns2893862:0crwdne2893862:0


crwdns2889612:0crwdne2889612:0 0