Power Adaptor Problem for mac mini.

mac mini a1283 is not powering when switching ON. how do i test the output voltages for the power adaptor for my mac mini.

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

crwdns2894050:0crwdne2894050:0

crwdns2889612:0crwdne2889612:0 0
crwdns2892346:0crwdne2892346:0