Base unit will not work for Plantronics

Hello, I recently purchased a new charger for the base unit on my Plantronics CS50, the light will not turn on no matter what I do. Do you know what might be the problem?

crwdns2934089:0crwdne2934089:0 crwdns2934093:0crwdne2934093:0

crwdns2934109:0crwdne2934109:0

crwdns2889612:0crwdne2889612:0 0
crwdns2934285:0crwdne2934285:0